Maybe it's a state by state thing, but here in PA to get an epinephrin pen you need a script (at least, that's how I got mine). It's odd - the TSA web site talks about insulin etc, but doesn't mention this. Perhaps it might not be a bad idea if she has 1 in her carry-on and 1 in her checked bag. It's a bit dodgy, though, carrying any prescribed medications without your name on them.