If she is a LMT she should have a lot more flexibility with where she works. Maybe she should just find a spa that is more flexible. Or go into business for her self.
Its crappy that a spa would be so lame. Most spas are hippy granola places. But to not let a mom pump is crazy. All they would have to do is schedule her massages with a 30-40 min break between them. I doubt they are paying her by the hour - they are probably paying her per massage or a percentage of each spa treatment so its not like they would have to worry about giving her paid breaks.
Anyway - I would love to know what spa she works at so I could avoid them like the plague. I live in NM and would hate to give them my money.