I have to run out for a couple of hours, but I'm pondering this, & want to re-read it more carefully.
For now, do nothing. Say nothing. Don't bring up the lease. If she mentions R, reassure that nothing has been done that can't be un-done, in time.
Mention that you & the kids are going to dinner & she's invited. Don't say whether the kids want her or you.
Dont push, No matter what. This could be real regret, this could be reality hitting her, it could be hormones. Sit still.
Do you fish ? Right now you're fishing. Be patient.
M 19 years, MC for 8 months, DB'd for 8 months 4 kids; 18, 15, 14, & 10 I was never meant to be a doormat. It took me years of therapy to become assertive enough to stop his abuse.