Mom to China

I currently live and work in Nanjing and have a valid resident permit (with a USA passport). My wife and son are under my resident permit as dependents. My wife is having a baby in October 2021 in Nanjing (the same hospital as my first son).

I would like to have my mother (with a USA passport and 10 year Chinese tourist visa) come to China for 3 months to help us with the baby and our son. She will receive the vaccine(Johnson & Johnson), July 12th. And would plan to come to China from August 15th - December 15th.

Would she be able to apply to come to China?
Does she need a new visa?
Does she need to go to an embassy or can do it through the mail or email? (she lives in Houston texas)
What documents does she need to fill out?

Thank you very much!

Best Regards,
Rony Tovar