Ok so my g/f is freaking out on me.

It was feeding time and i went to my pet store and they are out of feeder rats. SO i pick up a gerbil for my male and a Large mouse for my female. So my g/f comes home just as im about to feed him. She takes one look at the cute little gerbil and has a damn fit. Now im stuck with a rat and a gerbil. The gerbil is running around my apartment in one of those annyoing ball things and the rat in living it up in a tank on top of my book shelf. What in the world...am i going to do? has anyone else been through this with their b/f or g/f