Background: Earlier this year, before moving out of the marital home, I obtained copies of my WS's cell phone records and his contact list (the one from the "trash" which he didn't delete)

Anyway, in order to confirm that these callers were female and perhaps identify them, my friend and I went through the records. Several phone numbers stood out as being frequent/daily calls so we focused on them in particular.
In order to not have my cell phone number appear on the OW's phone records, we used my friend's phone to check the numbers. We called the numbers only once, let it go to voice mail and identified certain sources as female callers. One in particular, the subject of this thread, identified herself by name in her voice mail, which lead me to her fb connection with my WS and her picture and her real location, as her cell phone number was an out-of-state number, but her location is local. All of this information was given to my attorney with intent to call her as a witness, as my WS denies anything other than "being friends".
So, after several months of nothingness, my friend gets three local "hang up calls" on her cell phone. She called the number back and suggested that the person leave a message if they want to speak with her. We then did a reverse phone search and found that this was listed as the OW's local number. My friend decided to call the number back and advise that she knows whose number this is and that if this is her BS, to leave a message and she will forward the message (to me).
Unfortunately, my friend has a "burner phone" as she can't afford a regular service at this time. Most of her calls are her family members, and, when she runs out of minutes, she uses the house phone to call them back. She is my roommate at this time. So, she called the OW using the house phone and left the above message.
The OW called back (appeared on the caller ID). My friend answered the phone. The OW said nothing. My friend then addressed her by name, told her that she was named in her friend's divorce, told her to be a "big girl" and if she has something to say to speak, and if this is her spouse to leave a message and she'll forward it to me. The OW hung up. No further contact.
So, my question is, should I be worried? I have nothing to say to the home wrecker, as my only purpose in naming her in the divorce is as evidence of my WS's infidelity. I really don't care who she is and have no desire to speak to her. I find it interesting that she saved my friend's number, being that it was a one-time, short (30 sec) call just to go to her voice mail. It appears that she doesn't get many "hang up" calls on her cell and this one particular phone number she went back to, then called it three times.
Is she trying to harass me or something?