Is she undernourished ?

[unrezt]

Thanks to you all, well sorry for the typo , it's a she
I feed her every 5-6 days, the problem with rat is it's very hard to find here at my country , they generally only sell mice, mostly ranging from 6-8 grams each so I just buy mice for her, right now I try to put some weight on my mice stock ( i feed her live prey, well at least i knocked the mice first ).
Is there a problem beside taking longer time to feed her with 3-4 mice at a time ?
Regards
Jane

Don't quote me on this but to me it would make sense that a 20gram grown mouse would be healthier(because it is more developed) for your snake than three extremely small mice.