D
That looks so cold out!
From reading online, seems if she mated it was before you found her.
Chinese PMs mating to fertilization is 3 weeks. Though hasn't it been more than 3 weeks since you have had her.
8 weeks post egg sack (ootheca) detaching from the Female PM in a semi hardened stage.
(these 8 weeks are supposedly crucial, if you are planning to keep the nymps healthy and growing you need to set the temperature to 12 - 15°c or (53.6 - 59° F)
I am not sure if Geroge can reproduce asexually. Though certain breeds can one of which is a South African breed.
You probably need to conduct further research to figure out the time frame. As I see you posted this a while back. GL @Stanthropical
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That doesn't answer my question at all. 
I am sure if I a dug a little deeper for couple hours, I would find valuable details. Though I am on a time limit.
That doesn't answer my question at all.
Basic info- according to 1 random site no known time frame. I am pretty sure is not very reliable.
https://www.insectstore.com/mantis/is-your-praying-mantis-ootheca-fertile
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Edit-
https://insektenliebe.com/en/everything-you-need-to-know-about-an-ootheca/
Haven't read this. Only quick sharing.
@Stanthropical
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I'm perfectly capable of doing research, but I was asking whether anybody knows, not how to conduct research. 
Meow
I'm perfectly capable of doing research, but I was asking whether anybody knows, not how to conduct research.
Umm. Being misread is something I have grown used to... I wasn't trying to be harsh. I shared what I found and knew in a friendly way. I didn't mean anything else by it. I apologize if you misread me.
H
Harley31
Guest
From what I've read a fertilised egg sack will have a more uniformed shape and dark spots in it. An un-fertilised egg sack will not only harden after 5 days but start to shrivel up.
You can put the sack in the fridge until spring to delay hatching and release them in the garden.
You're gonna be a Grandpa!
I love my solar string lights.
