Often, UTR's start out as escorts and then stop advertising, and only see people from their current client list.
Most of us hobby in secret. We don't have a lot of friends who know what we do, so word of mouth doesn't really work so well.
If you have clients you want to send her way, that would be one way to get her started. Or, as someone else suggested, offer doubles with her.
I believe some women use sites like seeking arrangements to start out.
She could use blurred photos and take out an Eros ad for a couple of months and then, once she's got a client base, go fully UTR.
Finally, there was a girl who used to advertise on backpage. She posted a pic that wasn't her, but was similar, and in her ad she was very clear to say "This is not me, but is my general type." That sort of thing. It's not ideal, but it's an option.