My gf has BPD (21f) and I was hoping to get some advice on how to help her get through and grow from her episodes (for lack of a better word). 

Tbh it almost feels like walking on eggshells when I'm with her, not knowing what might set her off.

For example, tonight we were at our dance class and at the start we have to pick an intial partner to dance with. It doesn't really matter who you pick because you rotate partners every minute or so. After the class, I found out that my not picking my gf to dance with first as a partner caused her to have a sort of episode and she wasn't her self for almost 2 hours. 

She enters this state where she doesn't seem to care about anything and my attempts to comfort her don't succeed much.

Was wondering if anyone has any advice on dealing with episodes (not sure what to call them) and helping her rise above her condition, so she doesn't allow it to have so much control over her 

I love her and just want to do all I can but feel very lost. 

Do I just wait it out? Because they usually pass after a long while.

Thanks