Allergies, can arise ANY time... throughout a person's life.
Now, since I was a child, I have had a cat allergy. We had pets of all sorts, ALL my life. One day, I was allergic to cats.
What are my reactions?
- red swollen itchy eyes
- sneezing
-runny nose
SO, even if we have had pets/dogs/cats/horses when I was a child, I just learned to NOT put my hands to my face at all... while I was playing with or petting our pets.
THEN, washing my hands immediately afterward and changing my clothes.
It is the fur and dander of said animal, that triggers the allergy.
If she is allergic, you probably have to get rid of the cat?
Or she can take medications, per your Doctor.
OR, the alternative is... is that she is sick. And this is not an allergy.
So, TAKE her to the Doctor.
DO NOT GUESS.