I run a dementia unit for 6 years, I cant improve on anything that woofgang has already said, she is spot on, especially concerning your relatives choices and decisions, she may not make the choices you would make but she, like us are permitted to make the wrong choices and bad decisions. As long as she is safe from harm I would just keep a close eye on her. Their are "Memory Cafe's" all around the country I believe, you could possibly attend these to get more advice and information, you could maybe take your relative if she would be interested.