Puppy Pooping in Crate?

I have a 13 week old Rott. She is overall pretty good. She sleeps in her crate at night without having any accidents. If she has to go out during the night she whines to wake me up. 3 times a week I have to take my four year old son to preschool, I am gone no longer than ten minutes. I make sure she eats around 7am and take her out frequently during the morning and then right before I leave I make sure she poops. I leave at 11:50am and am home by 12pm. Every time I come home she has pooped in her crate, then plays in it and it is all over her, the crate, and sometimes even outside the crate. I feel like I have tried everything and do not know what to do. I have had 2 other Rottie pups in the past and they never did this. Any advice anyone could give me would be greatly appreciated!. Thanks!