good water.. .. no physical injury, I assume.
My guess is the hardness. Rams like soft water. Probably the hardness at your pet store is different from your tank. As you might already know, rams have limited adaptibility to different environments. Some rams are more sensitive than others. This ram may be having a hard time adjusting to yours. The stressed ram may stop eating.
Another posibility is the competition. If the rams haven't yet paired up, the male will consider her as an intruder in his teritory and will keep chasing her. In this case you need to provide her a place to hide. Lots of plants will help. Try to arrange the plants, so that there are separate compartments in the tank.
In both cases, an unhappy rams will turn pale with black vertical bands. The dosal fin will point toward the tail.
This is all i can think of. Somebody might come up with a better advice.
Hope she's ok soon. Ram is one of my fav fish.
G
ps. If not too much of a trouble, you may want to lower the PH a bit. PH 7.0 is the upper bound. I have heard someone successfully keeps ram at 7.8. The natural habitat is midly acidic though.