How to follow up with leads which are dormant

Hi! I have a new-ish friend who works at a big corporation. I give workshops to Employee Resource Groups for women. She knows someone at the Women ERG at her company. We’ve spoken about her making the introduction and she’s said she’d be happy to. But I know her—she’s wonderful but flaky. What’s the best way of reviving my ask, in a way that makes it most easy and most likely for her to make the intro?