Please take your kitty to the vet and have her eyes checked - the
test's not a big deal.  Although it's not real common in cats, she may
have glaucoma, which is treatable with eyedrops.  If left untreated
indefinitely it will lead to blindness and could require surgical
intervention.

Our older cat was diagnosed last year, and gets drops twice a day
(same med they give to people - I buy it at Costco Pharmacy with a
scrip from the vet to save $).  She's usually a world class stinker to
medicate, but passively accepts the drops - gotta figure they make her
feel a lot better.

The constantly dialated pupils were a big red flag for the vet. I've
dealt with all manner of cat diseases over the years, but was
completely unaware of this condition.  Cats cover up disabilities like
vision problems so well it's often something you don't notice until
the eyes are really impacted.  Our cat's virtually blind, but you'd
never know it - she still rules the roost and acts like she always
did.  Just like with people, if your girl has glaucoma, the sooner you
begin treatment, the better and she'll be a lot more comfortable.
Nancy T