yet another newbie question from LostNFound ... *sigh*

I am looking into different places to buy rats in bulk Now with Christmas and all that I having to wait till next week for the $$ to order the large quantity. Around here all I can find are large mice ... it's OBVIOUS that a large mouse is NOT enough for Avy. Honestly going but the as thick as her body rule she could go with a med to large rat ... SO... When feeding Multiples how do I gauge too much or too little ... I feed her 2 days ago ... one large mouse ... her skin is lose and she seemed REALLLLLLY interested in my birds yesterday so I got 4 more frozen mice today ... she took NO time to strike this time I barely got the mouse in there!! and when I walked by the tank later she was still showing signs she wanted more ... she has this mannerism when she smells food ... I can't explain but she was still hungry I thawed another and again she took NO time to strike ... So now what ... she still seems kinda hungry ... If I had a rat I wouldn't even be posting this ... ugh ...

do snakes stop when they are full?
or would she continue to take them if I offered?
I don't want to over feed her ....