I had this happen once also.  I keep their name in my contacts, as a tele market caller.  Then block the number.  If I never plan on seeing her again, I delate the number.  If I plan on seeing her, I keep the #, and unblock it.

Yeah that's an immediate no and red flag for me. I haven't been in your situation in regards to having to worry about my S/O about my texts. But I have had an also lower end provider text me multiple times if I wanted to see her, which is why she probably is on the lower end.

... and blocked on my phone.
I’ve never had that kind of text from a provider, at least not the initial text coming from her.  When I do get an initial text from a provider, it’s something innocuous like a simple “thank you” after a session.  Most reach-outs I get from providers are to my “hobby” email, which is ok to do any time.  I also let a few providers I know well and trust that they can ping me by text if they want, but to start with something like, “good afternoon, are you available to talk?”  I don’t leave my phone lying around so that’s safe.

A little communication goes a long way towards avoiding big problems. That being said, if she doesn't know the relationship status of a client, that's not an acceptable risk to take.

That's grossly irresponsible on her part.  I've had unsolicited contact before but not that often.  This is also one of the reasons I use a hobby phone.

This could have easily been a mistake or she was just trying to drum up business.  

My preferred method of reaching out to guys is by email. There are a few select gentlemen that I speak with all the time and they have a private number that I answer.  

It can be very inconvenient when something like this happens. I would tell her of the issue. Depending on how long she has been in this business she may have not even thought of the repercussions that her actions had. For someone attached this message was an absolute turn off but maybe for a single guy, he felt wanted and needed by that same text. We all have to learn what is appropriate to send to whom and when.  

Andrea Davis

it isn't expensive but a bit of a pain in the ass to keep adding minutes/extend use time but they're throw-a-ways when needed.  Even with that, I dump all info after an appointment.  Hardest thing sometimes is remembering where I hide the damn thing.  It's the cheap flip phone so texting is a real bitch.  I've probably had 20 of them during my hobbying years.

Get yourself a hobby phone. A Trac phone is a great option.  
Inexpensive and you can buy with cash and hide away where only you will know where it is.