With how specific they have her job, full name, and location and not actually posting as her in any of the communities and rage bait in the description, I strongly believe it’s a jilted asshole (rejected suitor or vengeful ex?) trying to ruin her life.
Fun fact, any women’s phone numbers you see in men’s bathrooms are almost always the same thing. I usually text them a photo, tell them where it is so they can ask the staff to remove it (or if I’m still around I’ll offer to scratch it out) and they’re always thankful because it’s some creep trying to weaponize horny dudes to harass them. The only time a phone number in a bathroom wasn’t a victimized woman was when it was a horny gay dude just looking for some anonymous thrills lol.