Hello Eveline
Normally when cats are on petfood it takes 7 days for them to recover from that after breeding is put on again.
There is though the Pet recovery vitamine which makes them gain love instantly again.
I hope this helps :-)
P.s. I'm not sure if there is an option in the online cattery to set breeding on as I breed in world.
It might very well be you need to take your cat in world for that.