My cat's tongue is out and she is drooling

So my 7 year old cat started to have her tongue out and drooling. I don't know what caused it. Can someone help me? 

It sounds like it could be nausea.  Is she eating normally?  She should see a vet as soon as possible.

Is she on any meds? Drooling can be a side-effect associated with certain medications. Tooth and gum problems are a common cause of drooling (aside from the nausea already mentioned). If meds can't be ruled out, it's an issue that requires a vet visit.

https://www.vetinfo.com/vets/answers/my-cat-tongue-sticking-out-and-why-she-drooling