How do I get over my frustrations with her illness?

[Taylor]

I was best friends with this girl for a few years but she started to devlope obsessive behaviors.Because of her OCD she got an eating disorder and became very thin and unhealthy. She stopped being as social and couldn't hold a conversation with me anymore. She stopped coming over to my house for awhile (she boards her horse at my house so she is usually over several times a week to ride). When she was at my house she couldn't control her emotions and any little thing could have sent her into tears. I am 17 now and sh is 20. She is at my house a lot but we barely ever talk. She doesn't go to school or have a job but for the most part she is healthy besides her OCD. She comes out to the barn to visit her horse that she can't ride because a birth defect causes it to be sore all the time. The horse will never be well enough to be ridden so a lot of people have talked about taking her to live in a nice pasture were it isnt as rocky as my place but she doesnt want to move her because she is convinced she will beable to ride her at somepoint. So she rides one of my horses instead. In exchange for cheap board she is supposed to be cleaning stalls 3 times a week (we have 6 stalls). She cries half the time she is cleaning them and takes a really long time to make it seem like it is harder than it is. It only takes me about 45 mins at the most and it takes her an hour and a half. She also doesn't do a good job or put any of the stuff away. She told her parents it was way to hard on her to clean stalls (she is completely capable) and she wanted more time to ride so she makes her parents do it. That really pissed me off because I have to work so hard and take care of the horses everyday and she thinks she can just ride and not do the work too. I really miss being friends with her but the way she gets out of dealing with the world really frustrates me. Also the fact that I can't tell if she wants to be friends with me or not is really confusing.