Healthy weight for adult? (pics)

[Dianna]

I adopted my 5-6 year old female BP about 2 1/2 months ago. She is approx 4 1/2 feet long. Her set up was lacking many important features, and according to her previous owner she was being fed 2 mice every week "or so". The previous owner had been unemployed for a long while, and I got the impression they were tired of buying snake food and perhaps had not been doing so on a regular basis.

Since I brought her home, I have been feeding her 3 plump adult mice every 10 days. She has not missed a single meal.

I have finally purchased a scale so that I may weigh her and her meals. Today she weighs 1280g, this is with a belly full of three mice (she ate on Friday) and has only peed thus far.

I have read other people's female BPs weigh up to 2000g! To my untrained eye (I'm new to reptiles), she looks healthy. I can feel her spine slightly, and I'm unsure if this is normal for a BP.

Is she perhaps just a petite girl, or should I try feeding her every 7 days (rather than 10) in an attempt to slowly raise her weight?

Here are a couple pictures of my sweet baby...