I've been hung in this limbo before - who's going to make the next move? Spend your energy on managing your emotions. The more calm you are, the more clarity you'll have about how to proceed. Acknowledge the stress and tension you feel, but remind yourself that the panicked urgency is a feeling, it's not reality. You'll know in your gut if you should reach out because you'll feel some peace about it. Ask yourself what
you want. Breathe through this and stretch your boundary 'muscles.'

Your aunt and in-laws are both accurate, I'd guess - she's extremely hurt and isn't managing her emotional response to that hurt. We are all responsible for managing our own emotions, and BPD means she isn't equipped with the tools to do that. It is still her responsibility, it's not something you should do for her.
In the spirit of brainstorming, if you're stilling willing to do some cleaning for her, would it work to organize your next response around her needs, or something you handle for her? If it's time for you to go over and help her, perhaps you could reach out and connect with her over that. If she gets upset, that means she isn't ready for contact and you know to take another step back.
You're stronger than you know. I hear it. You're going to get through this.