Caleb taught Elinore how to be Super Ellie! It first happened probably just over a month ago now. Caleb has always loved playing dress up and getting into coustumes for play. One evening he was wearing a cape and had gotten one our for his sister too.
The next thing we see is Caleb and Elinore running through the house saying "Super Caleb!" and "Super Ellie!"
There have been a few reoccurences, but more often than not, Elinore just randomly starts shouting "Super Ellie! Super Ellie!"