Don't really know what I should do right now...

I just found out, but 3 hours ago that my gf's mother committed suicide...
She suffered from depression for years according to her husband she just hid it well.
Now, my gf didn't speak a word of this to me. Over all these years we've been together so it kind of pissed me off that she'd keep something like that from me, but I really have no right to be mad that she did...

I just don't know what to do as I've said. All I really can do is be there for her as I always will, but I feel like I should do something and it's driving me crazy that I can't think of anything. The comfort of a lover can only go so far right?