I am in a similar situation. Wonder, Will she still be living with OM...?

Sounds like you are saying that D will only be living with you? Why? That's not the way I have understood it.
Anyway you need to be prepared for take care of your child 100%, for the rest of your life (at least every other week).

Without understanding the situation fully, in general I would say, if she has moved out she aint moving back in to your house unless we are talking like weeks/months into reconciliation.

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