People also seem to think this automatically makes Elune at the Winter Queen's level. Elune could still be a first one/"god tier" power, she could be a much older sister (or maybe the Winter Queen/Elune weren't born in a typical sense, but are manifestations from the chaotic energy that makes up existence). Plenty of stories have much tougher/stronger siblings, no reason the Winter Queen isn't the weaker sibling of Elune.