How much of the situation have you told her? Would you be comfortable sharing at least some of the budget with her, like this is how much we have per month, I need to save this amount for retirement, rainy day fund, the car we will need in a while, just in case the roof falls in, (whatever). Then we need to pay out this for bills, groceries, etc. This is how much we have left over for everything else (if there is any). If she can see why she can no longer have what she used to, she may be more willing to help out and get some of her own money.
As for chores, I don't know. It is hard when they have not had to do it. Maybe focus on one or two things, like I am working more now and I need help with the dinner and dishes, lawn mowing, bathroom cleaning or whatever. I know some families have made the kids bedroom their own domaine and as long as they kept food out, anything went. I cannot do that and I make my kids clean their rooms every morning before school and the basement play room at least once a week so I can dust and vacuum (mine are pretty young still). I am paying my daughter to do my least favorite chore- cleaning up the yard after the dog- so she can buy her most coveted doll (it's taking her forever to earn the money but hey, if she wants it she can earn it, right!)
Not sure this is much help, but giving kids (even teenagers) some ownership in the solution can help. If they can see the problem, help come up with a solution, and you are willing to listen to the suggestions, it may help especially if you can show her how you are sacrificing as well. Maybe say " I need help here, which of these chores can you help me with"?
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