Wow what a range of responses. I think a 16 year old is in kind of an in-between age and therefore should use an in-between approach.
She is not a child, and therefore should not sit down and shut up. Yes, she should respect and obey her parents, but that does not mean she should not try to engage with them as a mature person either.
She is a young adult, but not independent. So she can't make demands.
What is left is respectful negotiation. This is undermining her parents. Obey and then negotiate. Find out what their interests in the situation are. What options could satisfy their interests as well as the young womans?
The best thing we can do as parents is to engage with our young adult children in increasingly mature dialog and transaction. If they render us due rrespect, then we have a responsibility to hep them learn how to be successful with other adults.
This young woman could even mention to her parents that she wants to work with them to learn to successfully negotiate win-win deals and wants to use this difficult situation as a test lab. Will they help her?
From what I have read from 648E the friend sounds mature enough to take this approach. Her parents may be pleasantly surprised to see how well their daughter has successfully learned to be respectful and resourceful at the same time. I would be proud of such a daughter.
This is the exact approach I took with my two daughters and it changed their attitude about goals and obstacles. Whenever they needed something really bad and it seemed frivolous, unwise or inconvenient to me, I would let them know what I didn't like about the deal. Then I would challenge them that if they could come up with some option that met my concerns I would give it serious consideration. But, they had to accept that in the end it was still my decision and they agree to abide by the final decision.
Now, when they are living on their own they are more likely to not see obstacles as stop dead ends, but as a challenge to find alternatives and to explore what the underlying concerns are. Some adults will be open to this type of engagement and at other times there may be no room for negotiations and they have to determine of they want to stay in that situation or make radical changes. This works whether it is a job situation, family, a purchase, peer pressure, etc.
I say goodluck and I hope she finds a way to get to teh point that her parents are proud of her accomplishment.