I am not an EMT, so someone qualified may know better. But off top my head, I would think it'd be nice to have something with a one-hand opening blade, serrated blade and scissors easily accessible from the MT. So I would recommend the following from Leatherman:
Free P4(the newest mid-size tool)
Surge(heavy duty tool)
Wingman(inexpensive budget choice)
And depending what she use most often, there is always the Raptor Rescue for the job too(a shear with multi functions, but I figure they may prefer the disposable shears)