If that was me I'd wait for her to contact me, since she initiated the D, but I can't really tell you what to do. Definitely wait a bit longer though, as 2 months is much time to realise what she's missing.
(I waited a year for mine and we are now back in a tentative R after D).
Maybe, if you think she's missing the boys (could be that she doesn't like to ask because they're not biologically hers?), maybe you could send her a card, saying if you would like to come and visit the boys, they'd love to see you.
Then that leaves a door open for her without getting too heavy about the R. If she responds, it also gives you the opportunity to suss her out more and see where she's at, atm.
