AIBU to ask for help re DD who has gone away for weekend when she should have been working

What was the job and does it matter if it’s done today or next week? And can she get it done next weekend with out any bother?

Where has she gone? It’s the last of the summer, and nice weather. There may not be many more opportunities.

Actually, if you read what I wrote elsewhere, that's not what I proposed at all

Change the locks while she's away. Adult with free will can find her own place to live.

Actually, if you read what I wrote elsewhere, that's not what I proposed at all

She can’t sack her, no, but what are the chances that the OP would stick to not doing the chores? The fact that the DD fucked off in the first place hints that she doesn’t care about consequences. Also if she was pulling her weight, not doing the chores wouldn’t affect her as she should be doing her own cooking, washing etc and also some of the housework.

Turning her phone off was incredibly immature but she clearly doesn’t think anything will happen as a result

I believe it may force her to confront the reality of the situation.

Agreed with pp, paying in advance was not very sensible, but selling her stuff is not treating her like an adult. You actually wouldn't be able do this to any another adult without a court order, so it is really just infantilising her to do that. Also it would be grossly disproportionate because that the cost to her of buying replacement items would almost certainly be multiples of whatever you would raise selling the stuff.
I'd go for changing the wifi password at home, and refusing to fund anything for her that you would normally assist with until the value of that is equal to the money she essentially scammed out of you.

Sit down with her and ask her quietly to explain why. If that doesn’t work you have a problem and she has a worse one.

Do you not think there is a half way between doing nothing and changing the locks?

Good lord, the number of people who are happy to burn the relationship with their daughter to the ground. "Selling posessions on ebay" - come on. Why would you escalate this?
Behave like an adult, treat her like an adult. Firstly, this sounds like this is out of character - I'd explore that first. And then tell her that she needs to repay the money and that she's let you, and presumably whoever she was supposed to take to the airport, down.

What was the job and does it matter if it’s done today or next week? And can she get it done next weekend with out any bother?

Where has she gone? It’s the last of the summer, and nice weather. There may not be many more opportunities.

Lol! Change the internet password when she comes back? Stop paying phone/car/food?

I'd tell DS, if he pulled something similar, "got €100 for your gaming computer on wallapop, cheers mate!" and send a pic of DH and I drinking cocktails!

Not really - do you honestly think Mum should just let it go? Chalk it down to experience ?

I agree, it’s an odd feature of mumsnet that a lot of posters love dishing out advice about how to punish people, and it’s always childish and petty, if you actually behaved like that it would totally destroy your relationship with your child/teen/adult child.

In real life the advice Ponoka7 is best, talk to your daughter and find out what’s going on, tell her that your are disappointed she did this, and ask her how she can make it right , as grown ups you can both have a grown up conversation!

if you behaved like this at work and your employer confiscated your belongings - they'd be liable to legal action. It would be a warning or possible sack, OP can't sack her daughter, though she could give her a final written warning - but withdrawing and not doing the chores would probably get the message over loud and clear

Entitled = an example being that she’ll agree to something but then if a better offer comes along complains that she’s being taken advantage of as opposed to realising that’s life! Have you and her DF taught her that that’s life? Or have you tried to facilitate her to do what she wants? Have you both taught her what being an adult includes?

This is out of character but she’s started getting more “I’m an adult now” so as a pp mentioned, my view is to go down the adult responsibilities route or sell some of her items of my choosing to repay it I have no idea about the legalities of it, but if she’s an adult, I’m reasonably sure you can’t just steal her things and sell them without her permission, irrespective of how much she owes you, whether you bought them for her, or whether she lives under your roof. That’s taking it from a civil dispute into criminality if she decides to make her point as dramatically as you. My advice would be to wait until she comes home and tell her that you consider she’s stolen from you and she’s lost your trust and your respect. Tell her that she will be repaying it. In the meantime, if she wants to be treated like an adult then she needs to understand that meals/wifi access/laundry/phone/share of utilities doesn’t come free, so will she be earning them by doing chores or getting a job and paying for them herself?