Send the flowers. Or call. Or send a message saying "I'd love to call you - when is a good time?" and leave it in her court.

This is all based on my feelings in July last year. Not enough people made the first move, and I got so so SO sick of always being the one to take the deep breath and call someone, or be the first to talk about "it."
As for pregnant friends... depending how much she knows your history, it might be OK. I know for me, I cope really well with pregnancy announcements if I know it's someone who's taken a hard road to get there. I don't know why - it's like it feels "safe" and they're less likely to say unappreciative or ungrateful things about their pregnancy, or use stupid cliches in an attempt to make you feel better.

So, that's sort of my advice. Give her a bit of time, then make an offer to see her, or talk. And then don't be upset if she doesn't want to.

You'll know what to do.