When your daughter has turned 14 years of age then admitting her in such a school where male teachers are teaching is not correct. If you want to give her more education then choose a school with female teachers. I have heard that there are such schools in Gujarat and Aligarh etc where girls are taught in purdah. It is not a bad thing to seek knowledge but it is not correct to get it in coeducation atmosphere.
Allah knows Best!
Darul Uloom Deoband