Ideally two sisters that will play and get along with each other.
As others have said, this is a perfect example of things you can't control. I have had many csts in my life, including siblings that got along well, siblings that hated each other, different strays that got along super well and other that just could stand each other.
For me and good and bad are relative: windows 10 was waaaay better than 8, and for some aspects it is quite good, objectively it's still crap for many other things
/swapfile joined the chat
Try and ask her the real reason why she might be reluctant. "Because they're muslim" is not a really strong argument; "because they are fundamentalist and they might extrange me as daughter or prevent me fron leaving the house if they found out" is a very practical explaination on this compromise she decided to take.
Families are complicated and sometimes shitty, but it's her family and navigating around you and them could be difficult (she might love her parents and want to maintain a relationship with them, or she hates them but relies on their financial support, both options are valid)
And a lot of support, especially aimed to the beginner userbase. Most basics questions a first time linux user will encounter are usually answered to by searching the forum