The snake body (from my research and experience) has to go though preparation for breeding, that is why timing is important. I do not believe (but I have been wrong before) that your girl will even have any follicles left after she lays her eggs. From my experience, after my girls lay, they are empty. I can not feel any "left over" follicles.
While I agree with Robin, I don't think what you want to do is possible anyway. Because, if I am reading this correctly, you want to breed her to the Spider and as soon as she lays the eggs put her to a Lesser.