No Guarantee! I assume, that additional Calcium will help her grow her legs stronger, but she may be waddling more than your other ducks. When my White Layers want to run really fast, like keeping up with the Runners, i regularly wet my pants: Imagine a big white round slipper on too short legs, bouncing from one leg to the other, while the whole duck is swinging sideways…One last question! Husband is super concerned about her still, do you think that following your instructions exactly will lead to full or near recovery?