It is a liquid right?

Are the 2 meds combined or are they seperate?
If they are seperate but you combine them try feeding them seperate, maybe one tastes worse than the other & you can disguise the taste easier that way?

Have you tried mixing it with canned cat food?

You can also call your vet, see if they can mix with some Pet Tinic (a liquid supplement a lot of vets have that they mix with bad tasting meds). Or maybe they even have a different med that tastes better that will work for her.