Mabrook, no one has the right to take someones life even if they disobey them. Fine they can disown them and kick them out of their house (if they are over 18) but you cannot phsycially harm anyone.
One of my dads cousin married a hindu guy in america, and her family disownder her. thats fine because she didn’t listen to them, so they didn’t have to be part of her life. (Not that i encourage people disowning family members)but i can understand it. It’s fair and legal and understandable.
However, if someone kills their daughter or physically harms her then they ARE extremists and psychopaths. If she is going aroudn sleepign with differnt guys, kick her out of your home, disown her, but you cannot kill her.
Even in ISLAM you cannot carry out punishments yourself, it happens in the shariat court of law. If the country you’re living in doesnt have those laws, move out.