J.S.
Hi -- I don't know of someone in that age group, BUT I think even moms with one child in a two parent household struggle with this. I know I felt isolated. I strongly recommend that she join a twins group (or possibly a single mother's group). She can try searching on meetup, via the JCC or just googling UWS or Manhattan Mother of Twins. Rutgers Church has a group just for parents (no caregivers) and maybe her nanny can help her logistically get there if it's not near there. I ultimately made friends through preschool/daycare, so if she can afford it a twos program would help her network. It takes a while!