HI
this definatly sounds like the virus my two had, Ollie my maine coon is always churping and very vocal and he lost his for nearly two weeks whilse poorly. Is she gulping when swallowing? Both mine ended up doing this as if they had (and I'm sure they did) a sore throat. They didn't eat as much but still kept trying but it was though their throat was too sore to eat.

The vet told me that a cats throat is VERY sensitive, more so that and humans or dogs etc and it would of been very painful for them.

They wer eon Metacam pain killer to help with the sore throat and then antibiotics. At first he put Ollie on Cephacare anit biotic but after 4 days Ollie was getting worse and so I took him back to the vets and then he changed it to Clavaseptin tablets and this worked fine. As soon as I changed the tablet started to see improvements after just a few hours. So wehn Stan then started with the same thing back to the vets and they both had a course. Ollie was better by then but thiught it best to treat them together.

Stan has just finished his tablets and they are back to their usual self and all meoas are not back.

I know it is hard as I was worried sick but it does sound like a virus that is going around this year and I'm sure she will be fine but a trip to the vets is needed I think.
Thanks
Allison