Sounds pretty normal to me, since she's passing urates it doesn't sound like she's impacted. As long as you don't see a "sausage butt" or signs of bloating she's probably fine. My BP went from pooping twice a month, to once a month, to every 1-2 months as he grew. It's good that you're paying attention to this so you can figure out her normal rhythm soon. Every snake is different and some go more frequently than others.