How to react to a partner who gives silent treatment whenever there is a fight

I (27M) am in a live-in relationship with my girlfriend (27F). I have seen a pattern, whenever there is a fight, she just goes silent. She doesn't talk, she covers herself in blanket and uses phone. I try to convince her to talk, beg her or even say something, she doesn't react at all.

I came to the terms that if the fights are serious, then I need to give her some space and trying to accept it. But even for small reasons she does that and I can't handle that silence at all. She has undergone a lot of trauma in her life and maybe that's why she resorted to this way of handling fights but I don't think that's healthy. I believe every fight can be resolved by having honest conversation but whenever I try she doesn't talk at all. This bothers me a lot that I can't sleep and ruins my next day.

What can be done to resolve this? Should I learn to accept the silence and wait patiently till she talks no matter what's the fight is about?