OP, sounds like Flora has thought better of this idea (hopefully) since she didn't mention it again. I think you were being a good friend to point this out to her--it sounds like you did it in an appropriate manner for a friend, and weren't sticking your nose in or anything like that. I suspect one reason she said the idea out loud--because really, she didn't need to--was to see what you thought about it. I'm sure she was hoping you would agree with her, but--that's the chance you take.
One of my friends told me a story about her in-laws. Grandpa usually spent the weekends in Big City with his girlfriend, but his pre-teen granddaughter wanted to visit him for the weekend, just him at his home in the suburbs, and that's what her mom preferred, too. So Grandpa says yeah, that's what we'll do... and as soon as he had custody of his granddaughter, he promptly took her to Big City to spend the weekend with his girlfriend. I think he called from Big City to let the girl's mom know. Fortunately the granddaughter had a great time, but I was pretty horrified and felt that would be a deal-breaker for me--last time my dad ever got to see his granddaughter unsupervised until she turned 18, in my opinion.