Well, I'd be careful then, if she's allergic to latex, because many prosthetic adhesives have latex in them -- lash glues included, sometimes.
Also, just a comment on pros-aide: may seem to blow your cosplay budget, but 2 oz. will last you for a VERY long time. I make PAX with it, and I've painted both my arms (entirety) five times, and it's barely half-gone, so pros-aide is a good investment if you can make it.
"I would like to be the air that inhabits you for a moment only. I would like to be that unnoticed and that necessary." -Margaret Atwood
~W.A. Mozart (Mozart l'Opera Rock) - 60% complete
~Blue Beetle (Young Justice) - 10% complete
~Ryuk (Death Note) - 40% complete
~Cheshire (Young Justice) - 5% complete