Julie, 40-45g is about average for an EB and they can weigh as much as 55g. When you say you want to 'beef' her up, do you feel like she doesn't look big enough for an EB? English Budgies are genetically much bigger in height and girth than pet budgies and of course we'd all like our birds to grow into their full potential like we do for our kids. Millets do promote size increase for growing birds but of course you want to use that in moderation. But Millets are also fattening and can have the same effect on birds as excess carbs on people. Since she is only 11 weeks old, I wouldn't be too concerned about her weight at this time. As long as she is placed on a healthy diet and under the best loving care, I'm sure she'll achieve optimal growth the way nature intended her to be.
HOUSE JEDI OF BUDGITON
"Let birds of ALL feathers flock together"
Thy Royal Court
Prince Kobe, Lady Gisele, King Chewie, Queen Betty, Princess Silverhawke (RIP 10/31/2015), Lord Artoo
Guardians of Budgiham Palace
Viserion, Rocco, Drogon, Rhaegal