Did it once and she's the only one with who I did it.
I have the same reasons here. I have mostly retired people who spend their days observing what's happening and asking tons of questions ...
This is my personal opinion and not all SP may feel the same, but certain factors can lead to a SP observing what's happening a lot, that have nothing to do with having negative intentions toward the client.

Sometimes it's a question of safety for her.
Other times, it has to do with privacy. We are observed all the time ourselves and if privacy between a provider and a client feels compromised, it can feel stressful. We ourselves don't want to be doxxed or to have a client accidentally reveal something we wish they hadn't, to others.
That doesn't mean she has intentions of doxxing or endangering you, but I can see how it would get annoying over time.. personally I'm always a fan of direct communication. Meaning if there's an issue it should be addressed and discussed.. I have addressed concerns with clients before.
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In the past most of my clients didn't use the internet that much to communicate with others, or not at all. In a way it's a good thing that'll people can share information, and I don't blame them..
This new dynamic of seeing many clients of mine post online a lot can feel stressful, particularly when they make allusions to our relationship or things we experienced together. I'm not talking about you specifically, this has happened multiple times with different clients. I also think it's their choice to do whatever they want, but it's something I wasn't used to. They also don't often have negative intentions.
Sometimes it just has consequences even if nobody anticipated it or wanted anything negative to happen. Once again, this is because things have changed and almost all the clients are on this forum and follow everything we post on social media now. When I entered the industry, that was far from being the case.
When I first entered the industry I didn't need to have the social presence I have today, I didn't care about reviews as much because most of my clients didn't even know they existed. In just 2 years this changed a lot.