Female ball python confusing me

Ok started breeding her in jan first lock with her and my lesser on jan 9th breeding going good always getting locks perfect she did shed at the ending of feb to the beginning of march after shed still breeding now April just started I don't know if I missed her ovulation through them days but now each time my male try to go for a lock she throws him off never seen her do this it like she's done with breeding her also she's 2643 grams her belly is big anyone know what's going on thanks http://imageshack.us/a/img29/710/imageqdqc.jpghttp://imageshack.us/a/img585/4243/imagenoz.jpg took some pics of her