Do you have any compelling reason to think that your DD 'in particular' is at risk for the sort of problems that are cured by single sex environments?
Looking at the research that has been done on this topic, I think EVERY girl is "at risk for the problems" in co-ed classrooms.
From Failing at Fairness: How America's School Cheat Girls : Girls are most often praised in brief exchanges with their teachers, while boys are engaged in conversation. In addition, the Sadkers found that smart boys get the most attention, and the smart girls get the least. This translates into a lack of confidence that follows young women into high school and college.
These are real issues. For every girl. Especially our smart girls, who tend to be so well adjusted that they just take it.
