MY DSS is 21 . Sweet sweet boy, love him dearly.
His mother and my husband and I had and still have very different ideas on how to deal with him.
We were the strict ones, and she was very very lenient as is the rest of her family, in all areas and still is, that includes financial help .
I won't give all the tedious details, but DSS learned the hard way we expect him to pull his own weight. If not in school, we expected to get a job , pay rent to us and help with some of his expenses. As he got older more and more of those expenses were to be given to him. We tried to help him learn to manage money. He chose not to go to school, and refused to get a job... at about 19 we ENCOURAGED him to move out because he was not going to live with us forever on our dime without working towards his future.
If he had been in school, gas money, help with expenses would have been given. Car insurance has been his to pay since he was 16, you don't pay , car disappears as it was in our name. basic cell service would be provided, but we were not paying for a smart phone service.
Entertainment and extra clothes would have also been his responsibility . I buy his clothes and shoes once or twice a year. But if anything extra is wanted it is on him.
What it boils down to is you and hubby need to agree on what is fair , and let her know how much money you are willing to give her per semester. . Period, end of discussion.
She needs a job in summer for extras , but if chooses not to get one, then Mom can pay or she can go without in my book.
Good luck, dealing with children that have two sets of parents with different ideas is hard.
They only way we got through it is setting our rules, without input from his MOM and sticking to them.
DSS is making his way through life and doing ok. He really hopes to go back to school soon. He knows that once he does, our offer to help with money will be once again on the table, but it is isn't a free ride. He knows exactly upfront how much he will get from us and he should spend it wisely. If he needs help budgeting we will be there for him.