HOUSTON—The family of a 9-year-old Houston girl still hospitalized following a road rage shooting asked for the public’s help on Monday in finding those responsible for injuring her. Houston’s mayor and police chief joined the family of Ashanti Grant in asking for information that could lead to an arrest and also announced that a reward in the case has been increased to $30,000. Larry Grant, Ashanti’s uncle, said during a news conference that his family is “crushed” by what happened to his niece, who was shot in the head. “We just want someone to please bless our family and please step forward. Give justice to Ashanti. She deserves it,” Grant said. Ashanti was riding in her family’s SUV at around 9 p.m. Feb. 8 on Interstate 69 in southwestern Houston when it got between two vehicles that appeared to be racing, according to police. One of the vehicles, a white …