When Maria came home

[Bassim]

I am wondering if my sentence is grammatically correct.

When Maria came home, her mother asked her with whom had she gone to the concert.

 

[teechar]

I am wondering if my sentence is grammatically correct.

When Maria came home, her mother asked her [STRIKE]with whom had she gone[/STRIKE] who she went to the concert with.

.

 

[GoesStation]

You can say with whom she had gone to the concert. You don't invert the subject and the verb here because it's a statement reporting a question, not a question itself.

Teechar's version is more natural.