What is the role of a hospital Social Worker? Do they have any confidentiality rules to abide by?

I'm concerned that a friendship or professional relationship between the Social Worker that called me during mom's recent trip to the ER and the Nurse at mom's Assisted Living Facility influenced the social worker's advocacy for my mom. Can anyone speak to the professional/ethical obligations of Hospital Social Workers? If the sate matters, I will Private Message it to you. Here's what happened. It's rather long, but I think the details are important.

Mom was recently in the hospital after a bad fall in her Assisted Living Memory Care facility. Initial ER assessment was that she had nothing more than bruises so they sent her back to AI. Several hours later another Doc read the scans and thought there may be fractures. They transferred her back to ER. Second hand, I learned that the nurse was so concerned about the amount of dried blood mom had in her mouth when she returned to ER that she had called in a Social Worker to discuss "writing it up". Another scan revealed several hairline fractures. Also determined she had another UTI which is being cultured to determine whether it's clinically significant. I live hours away. Social worker called me concerned about my dad's ability to make decisions about her care due to anxiety. No one was with mom when she fell at AI. Social Worker said that Assisted Living may get to be too much freedom for my mom. Too big an environment. We should be thinking about other types of care. She volunteered that info... I did not ask or lead her to that topic. It was a Q & A discussion with me wanting to understand terminology, options, etc. I said I'd been told that they were considering a "write up" due to the dried blood in mom's mouth. What did that mean? She said nothing was being reported. The ER nurse called later with an update and paraphrased the Social Worker's assessment that mom's facility might not be right without modification. Told me mom had a UTI. I said this would be the 5th, maybe more in a year and was concerned about that. She said it may have been the reason for the fall. I explained her regular docs plan for monitoring UTIs. I asked if she was the one that had been concerned about the blood in mom's mouth. She said she was. I asked about the write up, she said they decided that wasn't necessary but if she were me and it was her mom, she'd request 3 times the minimum monitoring required when mom goes back to AI. Several days later, The Nurse from Mom's Assisted Living Facility said that the Social Worker had called her. She and the SW talk all the time. Nurse said she had heard that I said SW told me AI was not appropriate for mom. Nurse said SW denies having that conversation with me. Wow. Absolutely untrue. FINALLY :-) my question... does it sound like the Social Worker acted professionally in this situation? I am very professional in my interactions with Mom's AI facility but always feel like they think my expectations are unreasonable. I want to understand the SW role better so I'll know whether to even talk to these folks in the future or whether it's just going to make me look like the bad guy again to answer their questions. Thanks for bearing with me!