Tell her she needs to start doing YOUR schedule at home. Stop rocking him to sleep (since you can't do that), be strict of the schedule. Tell her this is a must if he is going to have a comfortable transition.

Check in daily or every other day to see how its going. If she knows your on top of it she might be motivated to do it.

Make sure she knows how hard it will be on baby if she doesn't start this at home

And continue it on weekends after he has started care.

Consistency is a MUST