Hi - thought I'd just point out that I'm from the UK also and when you first look at the doha mums site, it doesn't look like there are many activities.
When she arrives, she'll need to attend one of the playgroups or new arrivals coffee mornings and she will then be able to join.
Once she's joined she'll have access to all the activities going on, not just for the kids, but for her and the whole family. There is something going on everyday and night - I really dont know what I'd have done if I hadn't joined Doha mums when I arrived!
All the best for the move!
Kerry