Hi
My DS gained an average of 100g per week in the first 12 weeks and our nurse was ok with this since everything else looked fine. I thought 150/week was about average.
I think it's important to look at the whole picture - Output is a good indicator of input, for example. Skin tone is other good clue, or alertness and having settted periods. Is she growing well otherwise?
She's probably fine, but it's always good to keep an eye on these things.