Print this out:
"Allergic to ALL penicillin products and their derivatives".
Then tape it to the back side of her drivers license. (ScarabKV- if you do this, use clear tape- electrical tape doesn't work as well...LOL!! )
God forbid if some thing were to happen and she couldn't tell some body this info, the first thing most people do is look for an ID. This will give them this crucial info in a split second.
On the back of my drivers license I have a few phone names/numbers of close (as in distance) relatives and a friend, just in case. They say to put on your cell "ICE"- in case of emergency for your closest relative but I keep my keypad locked so that doesn't work so well.