If you are looking to grow her faster, Rats are the way to go definitely. Even Rat pups for now.

Mice give a 5.25kcal\g ratio and Rats give a 6.37 kcal\g. This might not look like a lot, but if you were to feed your snake (obviously when it's bigger) 2 Adult mice around 50 grams each, that meal is 525kcals. But if you were to feed that same snake a 150 gram rat instead, it would be a 956kcal meal. (Again, this ratio is assuming a medium rat would be a good size meal for your snake, numbers would differ for smaller snake, but the Rat<Mouse ratio is the same). Other than that, Until your snake really needs a large rat, feeding it 1 adult mouse a week at this size would be perfect.