I'd suspect that she has difficulty absorbing Vitamin D and Calcium from her food. This appears to be rickets. That would be consistent with the straddle leg.
I'd increase the combined calcium and vitamin D in her diet. Be sure to limit the amount of grains for her (and in younger birds) as they're higher in phosphorus and a calcium/phosphorus balance must be correct for calcium to get used. This is called the "cal/phos balance".
btw avoid spinach as tho it's high in calcium, it's also high in oxyaltes that can bind the calcium and make it unusable.
Honestly were she mine, I'd get a cage bird supplement like Prime that has a little more calcium, but is balanced out and give that to her for the next month.