I've been to the hospital a second time, but the nurse said that Laura was particularly distressed and it was better that I didn't visit her.
However, Laura's mum phoned me to say how grateful she was that I'd taken the trouble to help - we chatted for more than 15 minutes. Laura has been suffering from mental/depression problems. Her current stay in the care home is intended to integrate her back into society.
I've offered to keep in contact with Laura, if that would be of help in any way. Mum has my phone number, and I have hers!
Oh, and being the same age as my son, Laura and he have school friends in common!