I’ve had this headcannon in my mind for days where if Anna and Kristof were to have children, Elsa would totally put her 110% effort into being the best aunt ever to make up for the fact that she neglected her sister. So to make up for all the times Anna asked her to play and she said no, I could see Elsa being the one to always ask her niece or nephew if they want to play. Kind of a sad headcannon but I could totally see Elsa doing this as a way to “redeem” herself and not make the same mistake twice.