I don't think it's dangerous. If she was allergic, she'd probably be
in big trouble by now! I was reading an interesting article in
Discover a few months ago on a comparison of strings in the animal
kingdom. Bee venom is designed to discourage, not kill. Bees don't
go around hunting mammals, so they haven't evolved such a strong
offensive weapon. Bees and hornets do have compounds in their venom
that are specially designed to stimulate pain receptors though.
I was stung a few times a couple of months ago by hornets (I was
setting up traps next to a nest that they built on the side of my
house). One of them tagged me really good, the worst sting I'd ever
gotten. My hand was bleeding from the sting site, and I got the
chills. I just put on a sweater and continued putting up traps.

My hand was swollen for a few days.
I remember the first time I was ever stung by a bee. I was five years
old, and I found a bee struggling in a little puddle of water. I
picked it up to rescue it, but it stung me and flew away, and I ran
home crying to my mom.