Enabling financial dependency from an able bodied adult child, is a great disservice to her! Your daughter seems to have gone from being taken care of by mummy and daddy to being taken care of by dear hubby.
Her bratty behavior is actually anger/insecurity and may be a cry for help. She doesn't seem to have mature adult skills/ behaviors necessary to survive in the real world and she never will, if you keep paying her bills for her.
Help her by giving her the tools she needs to stand on her own two feet. She may need skills like how to balance a budget and a checkbook, how to use the internet to pay bills on line, save money, reduce debt, boost her career and learn how to be independent.
By having to manage her own life she will also have to weigh the true measure of her paycheck hence prioritize her expenses.
You can still support her by offering child care and possibly even a place to stay, but only until she gets her finances sorted out without your subsidies (no more than three months). A qualified social worker who specializes in life skills and debt counseling can help you all get started.
Whatever you do, stick to realistic deadlines. The sooner she gains her independence, the better for all involved.
34 year old assisted euthanasia
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