I have been to a locked unit in a community hospital where the phones and computers were taken away but there was one free landline per whole unit in the hallway and also one laptop in the common area that people took turns using.

I have also been to both locked and open units in a private teaching hospital. On the locked unit, the cell phone was taken away for the night and charged, using my charger, in a special room, and then given to me during the day. Same with the computer. No charging cords, obviously, because they are a hazard (you can strangulate yourself with a cord). But at the private hospital there was staff to charge those devices, something a public hospital likely will not have. On the open unit, I had 24 hour access to my devices and charging cords.

Have you tried sending her an email, a messenger or Whatsapp message, etc.? There might be a shared computer where she is and if she is able to log into her accounts, she would get your messages. Of course, this, assuming that she is well enough to use the computer and that she is positively disposed towards you and willing to communicate with you.