Alright so ...

It's not bad for the snakes health to be eating the old rat?

And feeding her directly into the cage wont cause her to bite (one slip up and she bites my mom ... I get it taken out of my hide).
This particular snake [Nova] was picked out by my mom at a reptile show so she became a family pet unlike the rest of my herps. So it's really important that I don't have this one biting [unless the rats are bad for her and feeding her in such a way was the only way of getting her healthy food. Health first]

Thanks everyone for the help so far I really appreciate it,

- AJ