Regarding non-bio mom stuff, there are a few non-bio-mom specific resources (a couple private groups) out there I can point you to if you PM me. I would link directly but my understanding is that MDC prefers we not do so. I ended up finding most of my support for such issues online (and even then it was quite a stretch, which is one reason I like to make sure to offer what I do know of when it comes up), but there is a bit more available now.
Have you been able to connect with any other parenting resources (GLBT specific or not?). We found great support and wonderful friends through basically the mainstream baby groups in our area (granted, we're in a large urban area). For GLBT specific community, we've kept our eyes out, and made sure to connect with any families we come across (we're great friends with one two-mom family in our neighborhood who we called when they posted looking for a nanny, and outed themselves on the flyer...a bit forward of us but it worked out great!). We've also connected with other queer families through two queer-friendly religious communities we've belonged to. Organized GLBT parenting groups can be very hard to come by, even in places with a large population base.
Also, not sure exactly which issues your partner is struggling with, but I'd encourage her to consider attending the "regular" parenting groups as well. It's not everyone's cup of tea, but I absolutely loved taking our daughter to mom & baby groups. It didn't take long to stop feeling like an outsider (only mom in the room not nursing...only mom without my own birth war story...) and to start feeling like just one more mom. I particularly loved going on my own. That alone did wonders for some of my early insecurity as a non-bio-mom.
Good luck to both of you.