Another vote for “take her to the vet”.
I had a cat that began having seizures. It didn’t take long to figure out that Lucky had a brain tumor (he soon began “going around to the left”, since one half of his brain wasn’t functioning properly; this is a dead give-away that there is a brain problem). I cared for him for a few months until one day he was gone. The body was still there, but the cat inside was gone, I mean. It was one of the saddest, most pathetic things I’ve ever been witness to and I had him put down ASAP. I loved that cat and I’m glad I was able to make his last weeks comfortable and loving, but I wish I had spared both of us that last bit.
So please, for both your sakes, take your cat to the vet.