When Regina cast the first curse, the Blue Fairy helped Snowing with using the tree to make a portal.
This time, it is a new fairy doing the same thing. (Maybe the BF actress isn’t contracted to work on Once anymore). Maybe Tiger Lily helped Henry and Lucy cross realms to EF 1 to find the tree?
Still, her inclusion is definitely odd. Maybe she is just Lily’s guardian fairy/fairy godmother, (hence why she helping with the tree) and she will help solve the curse conundrum? In which case she must be in HH somewhere.
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Keeper of Regina's bravery