In message Ablang
did ramble:

It's been probably 4 days since I last saw pee in one of her two
litter boxes. She still poops normally (about once every 2 days) and her
BM looks normal. So I'm guessing that either something's wrong with her,
or she is pee-ing on the rug somewhere that I still don't know about. She
is 2 years old next month. If she is pee-ing on the rug, wouldn't the
smell be obvious by now?

Vet vet vet.

What other explanation can there be?

Sick kitty.

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I've given up on sigs. I just couldn't think of anything clever to say.