Have Cat Questions? Ask a Cat Vet Online.
Short time voice loss could mean that she has an upper respiratory infection. Viral illnesses are also a possibility. If this is the case, your cat should recover with time. Keep an eye on the secretions from the nose or eyes. If they change color, the cat may need some antibiotics.
Long term voice loss could be a result of more serious factors and you should see the vet to rule out an obstruction, cancer, etc.
I am leaning toward the short term causes.
Let me know if you still have questions.
You are more than welcome. Keep an eye on her because respiratory issues in cats can quickly become serious.
I hope you come back with more questions in the future!