That's what I was thinking too. Diabetes. ^ My cat with Diabetes flooded the box so much it overflowed with urine like a bathtub spilling over. She lost a lot of weight too. It came on suddenly and by the time it was accurately dx I ended up trying the meds / diet for a while but ultimately put her down because it wasn't helping.
I don't know what Kitty meant by "she's peeing a lot". That could mean lots of output, like my cat flooding the box, or it could mean average output but multiple times. Maybe it means she's trying to go but can't.
My cats who have had UTI urinary tract infections usually scratch in the box but nothing comes out, or sometimes they pee on the floor to show me that the box "hurts" to use. UTI can be very damaging for a cat. They can develop crystals and one of my cats even had a grossly enlarged spleen because of all the infection.
Call your vet Kitty. They need to check for UTI first. If you can, collect some pee at home from the corner of her box and put it in a jar to see if it looks cloudy or if it really stinks. You can collect it with a spoon or a syringe. They might be able to do a urinalysis from that, or they might want to collect her urine on site with a needle. That's what they do for urinary cultures where they send the pee out to a lab and let it grow for a few days to name the contaminant and pick the right medicine. If it's not UTI then your vet might want to screen for Diabetes which involves blood testing.
This all sounds expensive but if you are disabled you can probably find a place that offers funding by a charity. Other places might let you pay over time instead of all at once.
Keep us updated on how she's doing. A pee shouldn't be much bigger than a tennis ball after it clumps in the litter. Count how many pees she's doing because the vet will want to know.
Good luck.
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