my girlfriends car has an issue with the clutch i believe

when i shift i have to be real easy on the gas or the car will Rev up real high
then the the Revs will come back down and it will drive fine unless i push the gas down hard then the rev's will jump back up


is this a sign of a bad clutch or maybe something worse

Sounds like the clutch may be slipping. To check, get going about 30-40 MPH, shift into 5th, let the clutch out, and hit the gas. If the revs go up without the speed going up, then the clutch is slipping.

can it be adjusted or do i just need to replace it?

Well, I will admit I don't know a ton about clutches. I think once it starts slipping though, that means it is wearing out and there is nothing left to do but replace it.