My kitty was spayed over 2 years ago. Everything went fine, etc. etc., she was happy and healthy. Well until two days ago. I noticed she was rolling around on the bed as if it was sprinkled with catnip or something. Okay, she’s a bit weird, no biggie. Except she kept doing it. Then she added the shrill chirp purring, and periodic yowling at nothing, and the raising her hiney in the air, and... yeah she’s in heat. How? Was the first spay botched or incomplete or something? Why would it take two years to show up? Is there anything I can do? Is this a one-off thing? Does she need to be spayed again? I’ve never heard of this happening before, so any suggestions are really welcome.