7-8 week old kitten not eating for 3 days! Going on day 4...?

Before anyone says TAKE HER TO THE VET, I already did today. My love found the female kitten when she was only 3 weeks old abandoned at college and brought her home to me. She was skin and bones. I gave her milk replacement which she took ravenously for about 2 weeks. I offered her kitten food along with this (GOOD food.... Innova Evo Cat/Kitten). After 1-2 weeks she kind of weened herself and only wanted the kibble. She put on weight wonderfully and began growing. She was very playful, energetic, lively and affectionate. The first couple weeks I kept her in the crate with minimal time exploring my room. About a week ago she uses my other cat's litter box reliably enough to be left in my room without being put up in the crate. My other cat is a 1.5 year old spayed female rescue and has adopted her so-to-speak. They are very bonded. About 5 days ago the kitten's 3rd eyelids started showing predominantly. Then it got a little better, but still shows. Then 3 days ago she didn't eat. The next day she ate 3 pieces of kibble. The day after that, nothing again. She is drinking and urinating normally. She is out of stool to pass and has lost a lot of weight in this short time period. I feed the cats separately. I do not eat in my room.... There is NO food to find and my room is kitten proofed so she hasn't eaten anything except those 3 pieces of kibble the past 3 days. I've tempted her with tuna, potted meat, chicken broth, milk replacement, canned food, you name it. I've tried feeding her by herself as I normally do. I've tried feeding her with the other cat. I've tried feeding her in my lap, on my chair where she lounges, on the cat post where she plays.... you name it. She just all of a sudden doesn't want food. She quit playing and started sleeping a lot. Today she stopped purring. I took her to the vet expecting an emergency on my hands. The vet did a full blood panel, snap test for FIV and leukemia, took her temp, checked her heart rate, felt her belly, looked inside her mouth... NOTHING was wrong with her that would cause this. The vet told me she has no clue. While I was waiting on the blood work for an hour, the vet tried to get her to eat some Royal Canin kitten food, and she ate a little. I consider that a very poor quality food, but I bought a small bag to see if that would bring back her appetite. The only things wrong with her were ear mites, a tiny case of ringworm on her tail and 1 flee that was found while drawing blood - all of which she got treatment for in addition to a dewormer (I haven't found anything in her poo, but just for good measure). I got stuck with a $350 bill and I have no answer as to what is wrong with my kitten. The vet said those little things shouldn't make this happen at this point. The only thing she could come up with was possible pancreatitis from the Innova Evo, but she's been eating it for quite a while - She said she really has no idea. I took her home, and after leaving her alone for a while to rest from the vet visit, she still won't eat. The vet says she should not be alive if she didn't eat more than what I said she did - but I watch my other cat eat her whole meal and there is no other food that even enters my room. The kitten does not have range to the rest of the house yet. PLEASE help! I'm at a loss.... Her diagnostics say she is very healthy (minus the tiny skin issues). This makes no sense to me and I'm really concerned.
I'm not just "switching the food" around on her - I don't want to give her a stomach ache. I fed her Innova Evo since she got here and she was supplemented with replacement milk until she weened herself and then only ate the Innova Evo. She has been eating that food for a month - the whole time I've had her. The only time I tried anything different was yesterday and the day before because she stopped eating - I tried to entice her with yummy smelly irresistible foods to get her to eat. And, as previously stated, she is fed separately from my other cat. I only tried once to get her to eat with my other cat yesterday, hoping if she saw her eating, she might want to join in. Nothing worked. I only got the small bag of Royal Canin because my vet suggested I do that since she ate a little while she was there. Again, this makes no sense to me.
Oh and fussing over the food - that was something my vet also mentioned not to do. I have never made a fuss of any kind over food as I find that silly. I just put the food in the bowl, then sit at my computer while monitoring them. The kitten's bowl is in the back corner of the crate so the other cat can't even get to her during meal time. My other cat is all the way on the other side of the room when she eats, and she finishes 100% in about 3 minutes. I'm not trying to be combative. I just have no clue why this is happening and I'm totally baffled.
 
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