Mogs results are back. Her urea and creatonin readings were a bit high, (creatonin was just under double the normal reading range, urea a tiny bit above normal) but the vet said overall it was a really good reading for a cat her age. They've brought out some medication; I can't remember the name, that's meant to slow down any kidney issues so we're going to give it a go.
Was a sad call actually, because the vet is leaving on Friday and I'll actually really miss her!