Is my BP underweight?

[redshepherd]

I was planning to feed once a week, every 7 days, but maybe I should do 5 days?

At that weight what do you think is the right size rodent? Maybe try a "large adult" mouse instead, as long as it's not too much bigger than her? I've seen conflicting advice that the prey should be slightly bigger, or exact size of the largest width... I'm not 100% sure on what I should be feeding and don't want to overextend her

If she'll take it every 5 days, you could totally do that! Just try and see.

I actually think feeding just slightly wider than the widest part of their body is ideal for growing little snakes, at least until they're sub-adults. You can measure the weight of the mouse and see if it is about 15% of her body weight (this saying only applies to young BP's), but I honestly just eyeball it.