Hi newmama2nala,
I have some more homework for you to do... lol, kidding ;)
But seriously I did want to reply again here to talk to you about the breeder that the husband went to.
I think you should get that breeders details from the neighbours, do it carefully and politely ect (im sure you can be clever with them) but GET THOSE DETAILS.
Then contact the breeder direct and ask to go and see him/her yourself.
Dont take Nala, but do take lots of piccies of her sleeping and being relaxed and happy in her saferoom.
Take whatever info the vet has given you.
Introduce yourself when you visit the breeder and explain what has happened and be sure to tell her that YOU want to sign an ownership contract with the breeder for Nala, to make her legally yours and connect you with her breeder with the standard contract they use.
If Nala is her finally decided name, ask the breeder to register (with TICA/GCCF) Nala with the rest of her litter mates if they havent already done so.
The breeder will be very happy to know you have discovered Nala's heat and taken responsibility to arrange her Spay, and soon too. Oh, and when Nala is in for her spay ask the vet to microchip her at the same time (should cost less) with YOUR details.
This bit of effort and time is worth it IMO to make sure that Nala is legally yours and eligible for her pedigree papers.
If that woman neighbour darkens your door to express a change of heart explain in your own polite way that, actually Nala is legally your girl now and she will be staying with her new owners.
.
Tell us, how she has been so far during your little mommy visits to her saferoom?
(Boiled chicken -warm- is best treat for her at this age)
Has she used her tray/s yet? ... if she does in front of you, talk sweetly to her and praise her, make her feel jolly proud and pleased with herself for using her tray.
-hopefully her poo'n'pee mistakes will be forgotten fast not to be repeated-