They guy may have been the owner, or a trusted guy the owner sends to check out the spas, or the trusted handy man, or driver.
The
spa owner usually has a driver to move his "employees" from
spa to
spa. In this case
he may actually be teaching the new
mamasan the ropes.
There are many reasons the old mama may have left here are a few.
1. She was tired, wanted to take extended time off.
2. She was sick, and needed to take time off
3. She wanted to go home and visit family.
4. She asked to leave, scared of
LE issues and does not want to be the next one to go down.
5. Serious illness or death in her family, and she went home.
There are many more, but you get the idea. Give the new lady a chance maybe it is a temporary thing and the other mama may come back.
I will be talking to the new one and getting to know her like the old mama knew me.