So basically you want to pair a female you bought today with your Pastel?
You need to quarantine her for at least 90 days before pairing her with your male unless of course you want to take the risk.
I would never consider breeding a new animal “ASAP” as suggested.
There is not rush this is not a race take your time, quarantine her wait until the beginning of next season and she will be even bigger than she is now.