The rules of breaking curses are – broad and often confusing. In my past experiences, it has always been family love that has saved the day.

[ whether it be anna's love for her or ingrid desperately needing the love of her family, it's enough to thaw the frozen tundra and shatter the mirror spell. family love saved storybrooke from regina's original curse. if past and present company hadn't confused her and sparked her curiosity, she would have powered the city with her mutual love for her sister. elsa is sure of that.

her hands remain fidgeting under the table, picking at the hem of her dress. it's difficult to look at him but she forces herself to. it would be impolite not to do so. ]

Princes are unreliable sources for curse breaking.