The best thing to do is to have a conversation about how you 2 are going to now help each other. Remind her she is an adult now so she needs to act like an adult to be treated as an adult.
No walking out when she is angry, she needs to stay and work things out with you. YOU need to quit being manipulated by her and afraid to deal with her attitude. She is walking all over you.
here are some suggestions.
Let her know that she will need to do her own laundry and grocery shopping, because since she has been gone, you really do not cook as much.
Also let her know that she will need to help around the house, but if she prefers to pay some of the rent, you could accept that instead of her helping with the house keeping.. You could then hire someone to come in once a week to do the bathrooms, mopping, vacuuming etc..
Base the amount on what you pay per month for your property taxes. For instance ours in $800. a month, so we would charge our daughter $400. per month.
Maybe also consider a percentage of the bills (include cable), cell phone and all of her car insurance. This is a very normal expectation while she is not actually attending school for the summer.
Remind her that she needs to find a job. It is her responsibility. Do not give her any money. No gas money, no clothing money no spending money.. Let her know she is now an adult and need s to pay for these things.
You decide on what she should be contributing to the household and hold her to it.
Our daughter is home for the summer and has a summer job. She also is doing all of her own laundry and even asks if she can add some of our things. She offers to purchase and then cook some of the meals.
She borrows our car, but fills up the tank every other week. She uses her own money for her entertainment. But mostly she is saving her money for when she goes back to school in the fall.
Our daughter knows that we expect her to be productive. The summers she has not had a full time job, she was volunteering at least 30 hours a week, taking every babysitting, pet sitting, house sitting job that was offered. She helped me with my events business and helped her grandparents as needed.
Yes, we allowed her to sleep in, watch TV some of the time, but not all summer. But we had spoken about OUR expectations.
I am sending you strength.