Courtesy of Marginal Revolution, a short video on the results of an experiment in India in which schoolgirls under 14 were given bikes. Did it lead to higher enrollments?
Another big factor in girls' school attendance in India is sanitation. This Mahatma Gandhi Centre booklet claims 24% of girls drop out of school each year due to lack of toilets. It's hard to see the data backing up this specific claim, though clearly a lack of school toilets is a big problem in India, and it affects girls disproportionately.