Actually, it did use to have some connection to dentures, as I remember my parents and others in their generation complaining that food didn't taste right after they got dentures.
So do get your friend to ring and make a new appointment with her dentist and with the technician who made her dentures.
Lots of infections from colds onward can affect our sense of taste too, so she might want to consult her GP as well.
Canary Islanders tell Brits to go home.
Lack of public toilets in towns.