A quick update:
I visited the hospital and found that Laura had, indeed, been admitted. I went to the ward she was on, but was told that she was 'resting', so I decided not to trouble her.
However, once I explained the reason for my interest, the nurse divulged much more information than she should!
Laura's mother had been in to visit.
Laura is being cared for.
Laura had drunk the antifreeze but there is hope that no damage has been caused.
Laura's mother was confused as to why my name and phone number had been written on the medical notes. The nurse will explain!