I would sit patiently and allow her time to settle down. You do not want to pressure her into talking about the relationship or where you go from here. If she is truly at the end of her crisis, it will take approximately 18-24 months before she's fully back in this world.

You have plenty of time to discuss "us" and for now, just enjoy the time that she's having moments of clarity.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.