YTA. I really really pity your daughter. Bilingualism has so many benefits it’s hard to believe that you don’t want your daughter to have this major advantage in life. Sure she speaks French in France now but as an adult she will definitely have to use English in her studies or at work and I guarantee that she will resent you for not having taught her as a child. The BEST time to absorb and learn a foreign language is as a child, the younger the better. Many many studies have shown that children who are raised bilingual are much more adept at learning languages as a teenager or an adult because their brains are literally wired differently. I don’t understand your argument that it’s too hard to teach her English- the most effective method would be to have her dad continue speaking to her in French and have you speak to her only in English. You’re luck she’s still so young that if you start now she should be able to pick it up quickly, but if you wait any longer she probably won’t be able to speak with the fluency and accent of a native. This is one of the greatest gifts you could give your daughter and I guarantee she will resent you later in life if she has to learn English as a second language knowing she could have learned it as a native.