i think Nixon took about 2weeks before getting back to his birth weight.
born at 2296grams
went down to 1980grams
took him home at 4weeks old weighing 2650grams.

40g gain is great too, wont be long before she is back to her BW i am sure.
she must be doing so so well, as nervous as you may feel now, imagine how great it will be that you can sit and look at her whenever you want and not have to wait until returning to the hospital again!!