In some of my earlier meeting the Lady would text someone just after I came in and time of appointment agreed. Then leave the room with the fee.
Some would even leave the room and go in to another room with the money.
On some occasion have I met a Escort who left the money in the room with me and wouldn't call or text.
As she wouldn't leave the room and just show me to the bathroom to shower or join me.
Yes the pimp is more likely to be there in another room or he could be working with another Escort. She text him to confirm that it extra time this client stay as he more likely have her next booking time arrange for her to take the call on next client.
Yes their is independent Established Escorts here who work alone.
But their is also a likely case that their is someone in background like a pimp\Lover boy in apartment or another Lady sharing.
But a pimp or Lover boy is no no for me. As he has no benefit for the Escort who working for them.
Only using and abusing her trust to which manipulating her into work long hours days week without a break.
Crimson is right it likely to be pimp or lover boy who she contact to.