Not PA - but something that I would be really careful about is using the orajel and then eating anything...I've used orajel, and it always ends up numbing my throat as well - I'd worry that it might mask some of the earlier reaction symptoms if she came into contact with something else.
I'm sure that you've thought about this already, but wanted to mention it, especially since if I remember correctly you're doing the baked egg dosing - I'd be really careful about using the orajel anytime near that.