Mark Roberts, 35, was found on Baildon Road, Weston-super-Mare, in October. He had sustained head injuries and died in hospital.
The girl has been remanded in custody and is due to appear before North Somerset Magistrates' Court later.
A 17-year-old boy has also been charged with Mr Roberts' murder and appeared in court in October. Neither he nor the girl can be named for legal reasons.
Two others arrested in connection with Mr Roberts's death have been released from bail with police taking no further action.