So if a gang member bothers you and wants a cut of your money, you run to the police? Then why do they get away with so much? Why do they have so much power? I do not think it is as simple as you make it.
Does she work for them or has just had the misfortune of having one book an appt then try to intimidate her? If the former, then she should just leave town I agree. If the second, then she needs security, on site, and someone to deal with this individual. If she is working in Surrey now, she should move downtown. This kind of shakedown happens fairly often in Toronto, with newly indy girls, since it is run by agencies, mps and pimps. An Canadian asian went indy once, had an asian guy book an appt, and he spent his time threatening her if she didn't come to work for him. Fortunately she had another sp older with her sharing space but she was pretty freaked out by it all. He said he would send bad dates to her, post negative things online, whatever. I think she left the biz, or left town.
The best advice for anyone getting harrassed like this is to take action, immediately and forcefully. Meaning call the police, report the incident, block the guys numbers, report the calls, keep records, etc. Guys like this rely on sps and young women to NOT do any of this, but it is likely they will back off if they are blocked. They rely on the idea that everyone who is doing this think it is illegal and they cannot report these things, otherwise they expose themselves to LE>
These guys back off if it isn't going to do them any good if it is going to be work to get what they want, is it? They will move on to the next one. They will unless someone does start a report on them anyway.