First of all, please don't feel guilty about the herbal calming aid. Herbal remedies aren't knock-out pills. She's probably pretty frustrated over her efforts to get George to play with her, so it won't hurt to settle her down a little.

As for getting another kitty, I would expect them to play together and ignore George. Around here I've noticed that the younger ones romp with each other and leave the older cats alone. I'm not sure whether it's best to get another female or a young male--sometimes females don't get along as well with other girls.

Best of luck with both sweet kitties!