Lynne and 'Mantha are in the shower. Lynne tells 'Mantha that when she was here yesterday, the water suddenly went off. She continues to tell her that the maintenance man wasn't able to fix the problem until she'd covered up with a towel.
It seems that Lynne and 'Mantha are showering at the gym. Lynne is now taking her exercise seriously and not only jogs but goes to the gym, apparently on a daily basis. 'Mantha isn't as health conscious and does not work out daily, thus she needs Lynne to fill her in with any news from the gym.
On this occasion of 'Mantha's absence, the water went off. A maintenance man was called and the problem was fixed. What exactly happened is unclear, but from Lynne's anecdote we can piece together the scene:
Lynne was showering and the water went off. Confused and wet, she strolled out to the front desk stark naked and told the receptionist what had happened. Embarrassed, the receptionist sent her back to the changing room to wait for their in-house maintenance man. Lynne sat there in the nude until the man arrived. He continued to stare at her until Lynne put a towel on. He then turned a valve and the water came back on.
Lynne seemed sure the problem would be fixed soon so she decided not to get dressed. Of course, the likely scenario is that she was covered in lather and needed to rinse her body before she could get dressed, and certainly didn't want to get her towel all soapy knowing full well she would need it after completing her shower.