I'm pretty sure TPF has meet-ups where they go out and shoot. I can address the other two definitely.
On Flickr, the group Assignment: Houston is pretty active. I guess I should say at this time that I am the group administrator. We are going to have meet-ups in March, April and May based around the assignments which are announced on the first of each month. It is also a good way to get out and shoot some photos. I'd also encourage her (or anyone else) to look through the completed assignments to get some inspiration.
http://www.flickr.com/groups/assignmenthouston
I went to a gathering of people from Meetup.com for the first time in January and had a good time. I think their next meet-up is going to be in March at the rodeo and I'm going to try to go to that as well.
http://photo.meetup.com/555/
Hope this helps.