I’m in a similar situation right now… just coming at it from the other side.
Starting when I was thirteen or fourteen, I really was the ONLY one who did any chores in the house – I did all the vacuuming, dusting, tidying, laundry, cooking, and kitchen-cleaning. Not an exaggeration, I promise you. I resented it a bit, mostly because I was Of That Age, but it was fine.
Flash forward. I’m staying with my parents temporarily. My mother (I love her dearly, and yet she’s also the person who would call me ‘slave’ with rather smug relish until the day I moved out, when she said ‘I guess I don’t have a slave anymore’ [I suspect she thought I found this terribly amusing]) was able to order me in the manner she liked to do whatever she wanted until I turned eighteen.
From that point, it’s politely requesting. It’s not a case of supplication, of ‘would madame be so good’. The request ‘Can you empty the dishwasher? I’d appreciate it if you did it more often’ or even ‘I need you to get the kitchen clean by the time I get back’ goes a lot further, with me at least, than ‘Hey. Go clean the kitchen, right now. No, you can’t finish what you’re doing.’
I get the latter from my mother, who remembers what it was like to order me around. I get the former from my father, who still thinks it’s in everyone’s best interests for everyone to treat everyone else with basic respect. With her, I do it but it puts me into a crappy mood. With him, I’m happy to go the extra mile and scrape the chartreuse gel (what WAS that stuff?) out of the back of the fridge.
I think “please” may be taking it a bit far, and a snarky ‘I won’t do it till you say please’ is certainly out there – would you treat a person in the real world that way? – but even though you may be in the right, kam, there’s something else at work here. Your daughter doesn’t want living with you again to mean she’s a little kid. You’re incredibly important in her life, I’m willing to bet, and in her eyes, if you don’t see her as an adult, nobody ever will. If you don’t treat her like an adult, she’s going to think you have determined she’s not worthy of that.
I’m going to assume kambuckta put her request in terms of ‘I need this done’ rather than ‘Do it now, you horrible little peon’. I’m not saying she’s wrong. I’m just saying that along the spectrum of ‘unreasonable requests’, neither cleaning the kitchen nor being polite about demands ranks a mouse’s fart.