Your cat may be doing exactly what you are doing now: crying for help.
I assume that she only started this behavior about a week ago and didn't do anything like that before. The fact that she jumps on you and meows is a clear indication that she wants to draw your attention to somethin--most likely the litter box.
Why? The litter box is clean. There should be no reason for you to notice it. But the litter box isn't only the place where feces lie around, it's also the place for urinating and defecating. Your cat may want to draw your attention to the act of urinating / defecating itself, probably because it causes her discomfort or pain. She may be constipated, have a urinary tract infection (UTI) or even urinary stones.
Get her checked by a vet and report as best as possible how much she pees and poops throughout the day. You should see the wet spots in the litter if she pees. Try to remember if she ate some object that may constipate her, like hair ties, a toy that disappeared or anything else. The vet may require some blood tests to check for a UTI and an x-ray to check for constipation.
