Lai Wah Heen - ok for someone that doesn't eat lobster, crab, pork and beef?
For dim sum, maybe not. They'd be eating har gow, turnip cake, chicken feet, and peashoots...! You'd probably be best off calling and asking them though. However, most dimsum will contain pork of some sort. If she's also not okay with shirmp, then I'd write off dimsum entirely. Ordering single dishes would be "safer"