F cat is 14.Just gained 5 lbs, incred thirsty, constantly urinating in box

cat question

New member
(used 2 outdoors only). Diagnosis? she's had full blood work, turned up nada. she used to be very athletic, outdoorsy, great mouser up until june of this year. started waking us up in middle of night asking for water which shed never done before. she's also using her cat box way more than she ever did. the smell of urine is awful. what is wrong with her?
 
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