S.M.
Maybe have her teacher talk to her about it in the middle of the day while you're not there?
Also for your 1.5 yr old, I would say not to switch as the change is very confusing for babies. They develop attachments which actually affects the way their brain communicates with itself. The more you break these attachments the harder they are to form, and the more the two hemispheres disconnect. With that in mind, I would ask your daughter to please stick it out for a few months, and try to find ways to help her play with other children on your days off. See if there is a MOPS group in your area, that way you're not committed, but you can go if you are off. Good luck, I hope it all works out.