What do you think of her?

I wouldn't have any contact with her at all. She seems like she's using you most of the time. It's a shame. She's taking advantage of you because you are probably too nice. Seriously, you should end any contacts with this person. Your friend needs to get a grip on reality, that you have your own life regardless of what she does with hers. She owes you some breaks, too. I'd bring that up if it ever does. Just backoff, don't respond to her texts, or calls, and don't answer the door if she comes knocking to "borrow" your time.