How is it that you think she chose anorexia? Why don't you learn about psychological and emotional states of mind where we don't have "free will" to just be the person others tell us to be.
You can test it out right now. If you have "free will" then I would challenge you to feel like I am right and you are wrong. Then, since you now feel like you agree with me, post about how I am right.
If you can't even choose to agree with me, then you understand what it is like to not be able to choose to feel differently about anything...
p.s. I wish I like to eat squash, legumes, and spinach. I think they are gross. I can't "choose to like them" even though I wish I could. 99% of things in life are like that.