Hi There,
Anything is possible, but I think that if Luna was allergic to Rame her symptoms would have shown up sooner. Perhaps Rame was carrying some kind of URI and the stress of having a new cat in the home compromised her immune system.
If Luna is eating normally, she will probably be fine, but otherwise she should see the vet ASAP. A vet visit should also be considered if her symptoms don't imprve within a week or so.
It's so good to hear that the cats are adjusting!
Take Care,
PHKitkat


