Sounds like a Beighton score she was doing. I haven't had any day to day problems. I have torn my cruciate ligament three times, but that could be to do with reckless skiing as much as it could do with hypermobility.
My mum recently had a fall that was a classic hypermobility thing. She tripped over the garden hose (it was in the summer) and put her arm out to stop herself falling, and the bone snapped just before the joint. That's apparently a classic hypermobility thing, the ligaments which are supposed to stop the joint over extending aren't strong enough so the pressure goes on to the joint, and when that pressure is too much the bone breaks at the weakest point, ie just before the joint.
In a practical sense, I've been told there's nothing I can do, being fit and strong is important as the muscles can compensate for some of the work the ligaments are supposed to be doing, but aren't.
I have had a few back problems which are probably down to hypermobility, I've damaged a disc because the ligaments supporting my back aren't strong enough, and if I'd known sooner I would probably have worked harder on my posture, pilates is excellent for this.
I hope you get some good support soon, but as far as I'm concerned it's not the worst thing, just something you need to be aware of, even more reason to keep fit and strong.