My Raiden will have his teeth cleaned in August for the first time. I'm going to see if I can get him to allow me to brush them for him to help keep the tarter from coming back so soon (yeah, good luck to me). He's had several annual visits and they never mentioned the tarter build up to me. It is quite common for teeth to have to removed in cats when things get too severe. Do not expect a breeder to take exceptional care of her queen -- the queen seems to be there to produce babies and may not get annual checkups from the vet. Especially, if they are overbreeding the female and the vet will give them a stern talking to.
Hopefully, your kitty will return to eating just fine with the missing teeth. You can always try the brushing of their teeth as well. I've seen YouTube videos and some of the cats love it. Just remember, you're putting your finger in their mouth!