It is true that BPs grow at different rates and a 1070g female at 3ft long doesn't sound worryingly underweight to me. My BP is the same way. Right now she's 3 1/2 years old too and 1391g at her last weight-in. She's always been on the smaller side, but has always been proportionate. In fact, lately I've even started to worry that she's getting a bit chubby! Now I've also seen power-fed breeders coming in at 2000g+ so as you can see, 1500g is less a rule than it is an average. What's important is that she's not losing a significant amount of weight over a period of time and has good body definition (no protruding spine, wrinkly skin, etc.)

As for your picky eater situation, how long has she had an RI? A lot of times illnesses, even very minor ones, put them off feed. The monthly fasts on their own aren't usually too concerning. My BP goes through periods of disinterest for about a month, once even two, right around this time of year (late fall/winter). But as always, there's a strong emphasis on correct husbandry here. Knowing more about your temps/humidity/enclosure could help pinpoint a bigger problem if there is one.

And were you looking to switch her over to F/T? Just speaking from experience, my girl came to me a live feeder as well. She took F/T right away, but it took quite a bit of rat-wiggling, holding it at eye-level with her, and making sure it was warmed up very very well. That and I guess I just got lucky. There's a bunch of tips around to help transitioning prey, and I think more experienced keepers would be better sources for that than me right now.

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