CathInfo.com

I think your advice will make her move out. It gives her all the skills to survive on her own and does nothing but estrange the parents.

Which parents want their adult child to remain a child indefinitely in their home? Isn’t the point for her to be prepared for adult life, whether she chooses religion, marriage and children, or remains single in the world. An unconverted immature woman will not make it in a convent, as a wife and mother, or as single in the world. Unless Our Lord returns, the parents will eventually die leaving their daughter a 13 year old in a 50 or 60 year old body, still unconverted. 
It’s obvious most of the commenters seem to think this 20 year old has a future in marriage, nothing else. Her behavior indicates she’s not ready for marriage, for being a good wife and mother to children. She’s not ready for religious life, either. How will she deal, at present, with having a superior?  Or living 24/7/365 with other women, some of whom she’s not going to like?  Equally unhealthy is to live as an immature single adult in her parents’ home. It may be necessary for now, but that’s not a goal. Even if she remains single and lives with Mom and Dad and God is setting her aside to care for her parents and run the household in the future, she isn’t at all ready for that now. There could be decades between now and then. In the meantime, she must finish growing up! Needling her parents by dressing poorly is NOT the actions of a mature woman. In fact, it’s juvenile. It IS parents’ job to see to it their children become mature adults. Keeping a child at home until 18 or 21, then showing them the door before they’re ready is a recipe for failure, especially for a girl. A young man can more easily cope with perhaps being homeless, couch surfing, taking on day labor as he finds it. A woman in that situation can’t cope as man. Not physically, not mentally, not spiritually. It’s almost a guarantee she’ll be taken advantage of and ruined A woman who does “day labor” rarely means she waits outside the convenience store for the vans to show up, “The boss needs five of you to install a barn roof and pull down three outbuildings and break up the cement foundations. The roofing goes for $150, the outbuildings for for $95 if it’s finished today. The men crowd the van in hopes of getting a day’s work. There are no women among them. Nobody hires a woman to to work eight to 12 hours breaking up cement with a sledge hammer and pick ax. Day labor for women almost inevitably involves selling their bodies. 

Assuming he wasn't the manager, he must have had crazy-mad, lightning-in-a-bottle people skills, to get tips large enough to support his family. 

There are some people who can pull it off.  I knew of one man who worked as a waiter and did very well with his tips, because he just had that certain something.

Yeah waiters can make good money. I worked at a mid-tier "fine dining" restaurant once and Fri-Sat-Sun a waiter could do $400+ per night. 2-3 slow weekdays would still bring another $300+..so you could be looking at 1500+ a week, all cash

I know a man who worked at Starbucks, raised 5 children on that salary, and his wife was a stay at home mother.

What did he do at Starbucks? If the answer is a barista or baristud, that was not the family’s sole source of provision. Were they receiving government benefits of any sort? WIC? HUD? Section 8 housing? SNAP? SSI? SSID? Medicaid? 
State programs?  
Were relatives like grandparents, siblings, in-laws, etc. assisting them financially or with other goods? Was this man being housed by his parents, grandparents? Living on family land in a trailer? Lived on a family compound of sorts?
Driving a car that was paid in full? Lived in a state that did not require or had very cheap auto insurance?  
They didn’t own a motor vehicle or shared one?
Lived off-grid, Amish style? Homeschooled, Unschooled, Gave birth at home with a family member’s or other’s assistance, didn’t register register births, didn’t register their marriage, IOW, were nonexistent to the state? 
But then he could not work at Starbucks!  
You don’t say whether this was in the USA, and if yes, where did he live?  
What I’m saying is that a job at Starbucks cannot support one person much less a wife and five children without having other support. 
If Starbucks was this family’s sole support, the father was not working behind the counter making coffee. Starbucks has higher jobs. Was he in an administrative job at Starbucks?  That changes matters quite a bit. Did he own numerous Starbucks stores? Was he the CEO or at a level or two down from that? 
Was he in technology or HR for Starbucks? 
This story 👃🏼 🐟y to me.