My rescue dog I've had for 2 months still snapping at me? Can I do anything to...

[val]

...resolve, so she isn't fearful? She's a mutt who I know was abused by her previous owner, Now I pamper and spoil her.. I take her fishing daily, we go on walks, I cook her food on the stove, cuddle and love her to pieces. However, when she is laying down, if I go to pet her at all, she will give me the "look" which is terrifying, then yelp loudly and bite at me. I believe my hand going above her body frightens her, and she reacts like animals do, impulsive, without thought. She always seems remorseful afterwards, but it's like each day she has to learn who I am again. Like Drew Barrymore in that movie 50 first dates. We go through the same thing day after day. She bites at me, I yell at her, then we ignore each other for about an hour and she comes out all happy and wants to play, I forgive her and life goes on. She's cranky when she's sleeping. Is her fear of my hand common for dogs? Regardless if she rips off one of my appendages or face she will remain in my home until her natural death, so I wish I could resolve this, as I would rather that didn't happen.