If she has never been to all-day school and it is only three weeks, keep her in it. It will help her prepare for next year. Now that she says she loved it, definitely keep her in.
As for your husband, let me give you some advice. Men do not think the same way you woman think. Men need to think things through and then give their opinion after they have weighed the pros and cons. It is something in us that makes us think this way. Kind of like the "big boys don't cry" thing. Accept it. Woman just give their immediate reaction, then they talk to all their friends about it. Men keep things to themselves. Woman expect men to think and react the same way they do. I am sure that when you first discussed it with your husband, he did not give it much thought (probably haviing other things on his mind), so he said little. Then after thinking about it, he realized that this would cut into the little time he has with your daughter before she grows up. Also, give the guy a break, he sounds like he has a very tough schedule which will take a lot out of anyone. Jay