Well what happens next depends on how she does as a mother and what kittens she has. We are hoping for a show quality chocolate kitten from her which we will keep. If we get that in her first litter then she will be neutered and not have any more.
If we don't get that then we will try again providing she has no problems giving birth or raising her kittens, if she does then we will neuter her as her health is more important. The absolute maximum number of litters we will have from her is 3-4 and that's assuming that she is in good condition, coping well and has no problems. If she ever 'has enough' then we neuter her and that's that. If we don't get the kitten we want in those litters then we give up again as her health is the priority.
We won't be rehoming her once she's neutered she's staying with us for life as she is a pet first and foremost. Some do rehome retired queens and usually have less litters from them in that case as they try and retire and rehome them while they are still young enough to easily get a new home. If you are not rehoming that's not as much of a concern but as she is our only breeding female we don't have to worry about keeping numbers down or overcrowding like some breeders do.
We've got 4 people waiting for kittens from her, one of those people wants 2 kittens if possible so if we don't get the kitten we want to keep or someone else backs out then they still have homes to go to. The breeder of our girl has been very helpful in that aspect passing along waiting list queries to us.
Ragdoll kittens are born pure white and their colour develops later so it takes a while to know if you have the colours you want (only blue and chocolate are possible from this mating though) and if they meet the breed standard enough to show. The kittens stay for at least 13 weeks though so that's a long way off yet anyway and we have lots of kitten cuddle time before then.
She's had a textbook pregnancy and everything has gone really well, I'm still a nervous wreck at this point however as I know the birth is soon. Average is 63-65 days but 60-70 days is normal so she's due any day now. I suspect I'm worrying more as I'm in bed poorly myself and so have more time to worry and nothing to distract myself. Hopefully she gives me a day or two to recover before D day, although OH and my mentor are on standby anyway to play cat midwife.