Since no one else has responded, I'll offer some suggestions.
Without knowing what the setup will be like at the "various events" where she's catering, it seems obvious she should go with electric countertop units that run on 120 v., since that will be most accessible. For the oven, a half-size convection oven like Vollrath's mini convection oven is a decent option . You might need/want something smaller, because that's large enough to be a two person lift, but it's reasonably portable. For the stovetop, a countertop induction unit like the Vollrath Mirage would be a good start. Vollrath's induction cooktops are really well regarded. Keep in mind, induction might be a change up for your girlfriend if she's never used it and it will not work with every pot/pan, but it seems to be growing in popularity. There are some good discussions of induction technology around ChefTalk (i.e. http://www.cheftalk.com/t/29609/induction-cookers-vs-gas).
Hope that helps.