This exact thing is happening to me too. I want her to be my mom, I want to be taken care of. I know this is wrong, but I agree that I like to keep that fantasy. It's like having the mom you never had, but hopefully that will also fill a need and then you grow past that, just like you would with a real mom, when you "grow up".
I don't know, this is all confusing, and upsetting. I feel "obsessed" and I don't like that either. I guess I have to learn how to "reparent" myself, but I haven't quite figured that one out yet.
This is rambling, but I just wanted you to know that you are not the only one! Take care.