C.O.
OOh man - that sucks. I'm sorry that their marriage is over.
I wouldn't contact her. You aren't close and if she hasn't reached out to you, she might be licking her wounds.
If kids are involved and she has custody of the kids - then I would just let her know she's still family and you still want to be involved in the kids lives.
Tough call, I know. I still wouldn't contact until the dust settles.