Do as LH says, but definitely don’t call her back yourself.
If it is really important she will call back or leave a message.
Once you have told her you need time and space try to stay real NC for at least a week.
That means absolutely zero communication. ZERO.

What is it that does not apply from the book(s)?

Me: 34
Stbxw: 30
D:5 D:3
Mini bd: May/June 2019
Married: Aug 2019
BD: 6th Dec 2019
OM Confirmed: Feb 2020
March 2020: I filed for D
Waiting for D to be finalized and W to move out end of January 2021