Hi Jess,
((((((((( hugs )))))))))) You know we understand.
My mother mentally "youthened", too, and wanted to go home to her parent's home, worried she'd be late for school and that her mother didn't know where she was. One thing I mentioned here long ago that really helped her was that I found 2 photos taken in the early 1940s of mom, her parents, and her brother and sister. I took them to Kinkos, enlarged them to 8x10, and put each in a plastic picture frame (not breakable). She couldn't name the people in the pictures at first, and repeated "It's them...him and him and her. In large block letter, I wrote the names Daddy, Mama, Frank and put that in the front bottom edge of one photo so Mom could read the familiar names. I did the same for the 2nd photo: Mama, Dorothy, Connie, Daddy. Mom was delighted to have those pictures as if her wish had been granted and she carried them with her for weeks.
My mother also had to go to a locked unit and it was not anything closed in that would feel claustrophobic. It was a hospital-like setting, with a large day room, semi-private rooms, private rooms, a dining room, and a nurse's station but it did have locked exterior doors and you had to be let in. The residents didn't have a clue they were locked in and didn't care. My mother thought she was on a cruise because the only time she shared a room was on a cruise to Alaska (I guess that's how she came to that conclusion). It didn't cross her mind to ask how I got onto the "ship" or why the scenery never changed, but she was having a lovely time, everyone was so friendly, and the food was good, so I didn't correct her! About that same time, she began having visits from her deceased sister. Again, I didn't correct her.
If it is suggested your mother needs to be in a locked unit for her safety, she will be in a new area and with a different staff anyway, so that would be the ideal time to move her to a facility closer to your home. Change is change and she'll adapt to where ever she is. You could do with a much, much shorter commute!! You deserve that.
I suggest it's time for your mother's anti-depressant to be administered daily and certainly when she's aggitated as she has been recently. If that's not an appropriate time to give a PRN medicine, I don't know what is!
Seems to me the staff should be able to distract your mother so she doesn't call you so often. You can tell the staff you can no longer get calls at work because you really don't need that disturbance and that's okay. You should not have to endure that even for your mother. Besides, your mother won't care for more than for a few minutes and she'll probably behave just like she does after she actually talks to you.
Take good care of yourself, dear heart. Barbara
P.S. belated thoughts -
Perhaps if it seems reasonable to move your mother closer to you when/if she needs a locked residence, you would make good use of this time to scout out a few such facilities in your area and put her name on the waiting list of the one that you like best.
Maybe the cost would be less, too. I paid only (did I write ONLY??!) $2700/month for Mom's care in the locked unit and $2500/mo. when she was back in the open unit. She'd forgotten how to walk as was in a wheelchair then and they deemed she couldn't escape.
Just a thought.