My Little Pony - Hi, I just dug out my daughters old My LIttle Ponies box from the 80s and wondered?

Hi! I'm afraid that's not an actual my little pony character (I know cause I watch it with my sisters when I babysit them) at least not one I know. The one that matches your description would be Pinkie Pie BUT she has balloons instead of kittens as a cutie mark.

I think your toy might be just an unofficial my little pony character. They aren't actual characters from the tv show or movies.