I was like this (though not as direct with insults: I’d get upset when my mum suggested I eat something specific because I didn’t want to be ‘fat like her’ but would never have stated that outright.)
I never received any consequences and was very much a latchkey kid, out of sight out of mind, which worked for my family as they stated they didn’t like having me around as I was demanding and I in turn hated being at home as I felt unloved and like I had to take steps to avoid anything going wrong whilst I was there as I knew I would be blamed.
however, once When I was about 14 I LOST MY S*T with my younger sister as she ate a slice of vegetarian ham that I had bought with my Saturday job/paper round money. I was given the only consesquence that I can ever remember , I wasn’t allowed to spend the weekend at my friends house: but as a compromise If I did something (no idea what) I could spend one evening there and come home at 10pm. My dad fell asleep and forgot to come and get me until 2am 😂
I was perfectly behaved, though quirky at school, until around year 8 when keeping up the mask was too much effort. When I was at school I was high as a kite, never disrespectful, just bouncing off the walls …or just didn’t go into school.
i now have a diagnosis of adhd and god my older teenage/adult life would have been simpler/less dangerous/expensive if I had received help for it before the age of 33! I also have some autistic traits but I self manage with fancy earplugs and trying to pause every time before I speak.
for what it’s worth I think the ‘earning’ increments to pay for the rest of the trip is a great idea. It is like a sticker chart with a younger child….manageable chunk and tangible, instant (ish) rewards for good choices are a great strategy. However, if she earns, say, £5 one day for speaking respectfully for example, it couldn’t then be taken away the next day for disrespectful talk. Positive discipline (I think).
masively agree with the potential for ND/mh issues but boundaries still needed. Wish my parents and teachers had had some more with me - well mainly just made me attend school somehow!
also, big yes to family therapy, with or without your 17 yo daughter.
please make sure you’re intentionally investing in your younger daughter too.
Also as awful as it is, I think you need to model apologising, esp for the ‘I can’t wait til you leave’ comment. It will have hurt her, and you can achnowledge that, without giving her a free pass to behave poorly.
**I was/am very sensitive and became vegetarian age 7 when I worked out where meat came from. My mum tried to bluff me on it and told me I could
make my own food, so I did, although she occasionally made me raw mushroom sandwiches (for the protein I was missing from not having meat). Anyway I basically ate pasta butter and mushrooms for years so that quorn ham was like caviar to me.
I now have a severe intolerance to mushrooms 🤷♀️