Assuming this is real...
Even "if" she left out the part about him texting her, even "if" you don't know anything about a phone, you never get involved with situations your woman has at work if it isn't physical. Ever. Be a man and encourage her following the proper steps and chain of command thru HR and senior management...
Why? Because you never know how these situations at work developed. Ever. And again I'm speaking from the premise of having no information shared, that there was phone communication. Doesn't matter. Your woman says she has a situation turning into harassment at work, listen to her, support her, do not make yourself a part of that story because YOU. DO. NOT. KNOW. THE. DETAILS.
Honestly you could apply this to any work scenario. Beefing with coworkers, beefing with management, struggling for acknowledgment, etc. Anything. Do not make yourself a part of that story. You don't really know why muhfukkas won't acknowledge your woman at work, maybe she doesn't do a good job. You don't know why that chick at her spot doesn't like her and shyts on her, maybe your woman initiated the bad blood...
The ONLY exception would be if he/someone physically puts their hands on your woman.......and in that scenario it's dicey to put yourself in it, for the simple fact if someone is genuinely touching your woman inappropriately (meaning without consent if sexual, or without provocation if violent--punch/slap/push) they've broken the law and your woman should have tge wherewithal to have reported that to both senior management and The Law if HR dragging ass about firing this person, your woman should already be ahead of this when she's telling you this and you're her support...
But I stress again, even if there's no physical contact, even if you have no reason to believe there was phone contact. You DO NOT get involved in your woman's work issues...