For me, the most important quality to have as a cm is being friendly and sociable. It really makes our vacation so special, when we meet cm's who have these qualities.
There will always be the possibility that a CM does not have all the facts or answers; but, I feel it is more important how the CM handles the questions rather than the facts they may or may not know. If they do not know the answer, offering to find out for you (If it is a situation where it is necessary to have the answer) is perfectly fine.
I just really appreciate those CM's who go out of there way to make you feel welcome. It is the reason we choose to go to DW for a vacation.
Good Luck to your daughter! My girlfriend did an internship there a while back and she said they work you very hard but, the experience itself is amazing. She also loved meeting her fellow co workers that are from all over the world.