I use Feliway on Oscar - he had a bout of idiopathic cystitis a couple of years ago, which is caused by stress.

The vet suggested trannies, and thanks to hearing about Feliway (cat face pheromones) on PT, I asked to try that instead.

I use a very stretchy collar on Oscar (not a breakaway collar, as his lower jaw got stuck in it when grooming and it DIDN'T break away! ). I shake the Feliway, and give a tiny squirt right into the collar.

Feliway is not cheap - but a little goes a LOOOONG way, especially with the collar technique (which my vet loves). Cats are supposed to be exposed to it for up to 4 hours, and since your Lexi moves even more than my Oscar does, the collar was a good solution!

Without the claws, she may just need a little help calming down.

FWIW, my vet told me cats are considered juveniles til age two.