Sometimes, patients in the hospital, particularly older
patients in an
ICU, can develop what is called a delirium, an alteration
in their level of alertness and awareness. Sometimes it can be associated with confusion and hallucinations. This will usually resolve once the patient is out of the ICU, though patients older than 65-70 sometimes have trouble recovering from this.
Depending on where your mom's stroke is, there can be changes in her personality.