Congrats!  Know she will be happy.  Might go for K&N filter, Demon Coil and Magnacor wires, some sort of exhaust ( if she likes sound).  Other than that go all out with induction, ignition and exhuast, then pulleys!  More expensive!  But all in all a filter and exhaust will give you 15-20HP, if you just want some improvement in fuel and performance.  Lots out there kinda your choice and how much you want to spend.  I basically just updated at service intervals and maintenance shedules.