That would make her 60 days pregnant today. She’ll be due in 5-7 days if you are correct about when she mated.
Hopefully by now mom cat has done the job of chewing the cord. But if not then cutting it is something that you will need to do. You'll need to tie it off in two places and cut between the ties.EMERGENCY!!!
She’s given birth to one kitten but she isn’t breaking the cord and the kitten isn’t feeding, what do we do?????