Thank you all for your opinions and advice.

I'm glad to hear I'm not the only one who perceived her reaction as fairly offensive/selfish. It saddens me a lot to think she might not be able to even respond subtly to my troubles; she's been a "close" friend for many, many years... And maybe more significantly, I don't really have many friends at all. After some events from my teenage years, it's almost like I've entirely forgotten how to actually go out and make new friends-- this very friend is actually the only one left from those years.
Basically, if I cross her off the list of potential "support," I have no other friends to turn to. Luckily, I *do* have a very supportive fiance and mother. After I left the hospital, I was also hoping to look into some local support groups to see if I could get connected with more people who can better understand. I do also have a personal therapist for one on one talks. So all in all, I have a fairly good support system still... It's just hard to talk to this friend every day and have her act like everything is peachy and/or she's grumpy at me for not being at my full capacity still.
I may try talking to this friend to see if I could smooth things over, but I'unno if it'd be worth the potential backlash. She tends to be the sort who takes things personally very easily. I'd rather keep her as a limited friend who I just choose to keep at arm's length than to lose her as a friend all together.