What do you do if your 92 yr old mother who has dementia has unrealistic travel plans to visit friends in her previous mobile home park?

Has your mom actually had a cognitive eval by a doctor?
Has she been tested for a UTI?
Do you or any local family member have durable PoA for her?
How is she planning to travel?
What do you mean by "unrealistic"?
More info would be helpful for better advice. Thanks