Yeah, it's pretty confusing to me too. And I'd be annoyed too..

What did you say to her exactly when you talked her about this? If she gives vague answers, she may just do all of this out of pity/politeness, like you said.

Or.. maybe she's just like that It can happen.

Still, I think you really need to talk clearly with her about this.. and making her understand how that makes you feel exactly.

Good luck!