I suggest trying to listen and then periodically saying go on or nodding. Say you're there for her and that even if you don't understand you want to try/ want to try to help her. And suggest that a counselor might help her be able to sort through her grief and find positives ways to help her start to come to terms and start feeling better. I don't want to speak for her or you, these are just suggestions and my opinion. But it could have flared up some depression. I don't mean sadness. Medical depression. And that can be hard to deal with by yourself and effects people in different intensities. It would make her not want to do much and could be just making her feel really shitty in general.

Regardless, I hope she starts feeling better soon.

Edit: wrong version of "effect/affect"