P.S.
Please know your stepdaughter does not understand your reasoning. All she knows is when she gets home,from what you
described, a disappointing visit with her mother, she has
another disappointment. (not having the same as your 2 children.) She equates that as not measuring up to your
"real" kids and she probably doesn't feel loved the same.
From what you say, she's probably not with a mother that dotes
on her and a mother that only wants to see her daughter 3 times a year, I doubt there is a strong bond. She needs to
know when she gets home how much you missed and shower her
with as many gifts as you gave your kids. It's not her fault
she wasn't there to share in the holiday with you. She has no control over that, but you do in the way you handle her
belated holiday with you. Please don't make her feel an outsider.
Good luck and God's blessings with your family
P. S