Okay, after crying my eyes out reading about lost pets, I called the vet and made and apointment for andromedathecat. She'll get all her vaccinations, worming medicine, and a microchip in case she ever runs away. I've not vaccinated her before because I have no idea what her medical history is before we got her. It's been 2 years, and the vet said it's okay to give her shots now with no risk of overdosing her. Just a little bit of pain now, and I can rest assured she will be as healthy as possible for the rest of her life. The microchip is inserted with a simple shot, and causes no more pain than a normal vaccination.
She was a rescue stray when we got her, and I don't ever want her to be stuck on the streets again. I love my kitty.