"Which are her socks" is a wrong word order in english?
It's right on what i know :)
Yup, and its Swedish counterpart is Vilka är hennes strumpor?
Your sentence is correct and elegant! I'm a native English speaker.
this is correct but not really often used (at least where I'm from). Usually I would say "Which socks are hers" but once again that might just be where I'm from
would "Which socks belong to her?" also be right?
That would be Vilka strumpor tillhör henne?
can i say which socks are for her?
No, that would be Vilka sockor är till henne?
Vilken or vilkan?????
Det är Pippis strumpor.