Translation:She does not understand why he does not want to dance with her.
"She does not understand why he would not like to dance with her" wasn't accepted. Seems like it should be.
I put 'She does not understand why he does not like to dance with her' - not accepted either.
That would be "... warum er nicht mit ihr tanzen mag." "Möchte" means "would like," meaning about the same as "want."
I tried the same thing. I thought "möchte" meant "would like" and "will" meant "want"...which if true would make our translation more accurate.