I think everyone who said Regina had a connection with Tink could be right.
Also, “A Common Fairy” seems to mean Tinkerbell didn’t make the final cut of being a fairy godmother. Or it could mean that she isn’t at all common despite PP saying so in the original story.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy