Sleeping and lethargy aren't the same thing. When my RB Peeka went into acute renal failure, I noticed that she was just lying around, wasn't grooming herself as much and she lost weight. By the time those symptoms exhibited themselves, she was already in renal failure and it was too late. She had to be PTS a week later. The licking that she did indicated nausea, which is one of the symptoms of acute or chronic renal failure. Perhaps your funds are limited at the moment (I can relate) but you'll end up spending much more money later if you wait too long. Plus you can save your cat a painful illness; acute renal failure is painful because everything shuts down. Again, I'm not trying to frighten you; it may be nothing but it's worth a few bucks and your peace of mind to have her checked at your vet's.
Btw, you said that you fear it could be something serious. Trust your instincts.
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