patdavies, I agree with you entirely - she can't have her cake and eat it. She should perhaps look towards getting a less demanding job.
If she does only work 75% at the moment, then that seems pretty fair IMO. Suppose you owned an airline, which by chance, employed all female pilots. What if you had to then give them all 50% time off for the same reason. You'd end up having to employ twice as many pilots with twice the admin costs, effort, etc. Where does it all end?
She'll probably win her case though.