Signs she won't go??

So last year was my first clutch, and this year I have four girls that I've been breeding. Are there any signs that she won't go? I know of all the good signs to look for (i.e. bowl wrapping, building, etc), but are there bad signs?

Being very underweight/age, or having hemipenes.
Other than that keep pairing. The season is long and not all snakes lay in the spring.
-Steven