Well I would suggest to just stick with your napping time and tell mom that you expect her to sleep from 12-2 (or whenever your nap is). Tell mom that means that she will need to adjust bedtime at home to a later time.

This little one is not going to adjust unless mom helps her to.

Hugs to you because we all know what it is like when nap time is dominated by a crier.

(And honestly, I would consider terming if there were no improvements. Rest time is sacred here.)