Could it be that her ex triggered some episode in her and she went cold on me? Well this is lasting for over a week... .don't know how long these episodes can last
It is quite likely seeing her ex triggered her in some way. How long the push lasts for varies widely. The more you read on this forum the more you will understand how similar yet different borderlines can be.
You can't force her into any action. If she comes back it will have to be on her own terms. Best thing you can do right now is educate yourself on the disorder. Learn what it entails, but in the event you do want to try and work things out, especially learn how to
manage a relationship with a borderline.
There is a ton of excellent information to be found on this site. A good place to start is here.
https://bpdfamily.com/content/what-borderline-personality-disorderThen you might want to read some of the other articles found on the right of that page. Important thing here is to learn, learn, learn. Make sure your eyes are wide open to what being in a relationship with a borderline will entail. I wish I knew a fraction of what I know now when I was with my ex.