Merle wrote:
You listen. Each person is different, some just want to vent, and other want to be consoled and told everything is going to be alright. Don't set false expectations nor lie to her just to make her feel (temporarily) better.
Exactly. You listen. There is no need to give advice. Don't badmouth him even if she starts; it's her time to vent. Just let her know that you are there for her.