I think Tamara is from FTL. I think she and her grandmother escaped FTL when Tamara was just a baby after Rumple killed her mother, Cinderella’s Fairy Godmother (The Price of Gold 1×4).
She definitly knows about other worlds and magic and she had to get that knowledge somehow and I don’t think it came just from knowing Owen/Greg since he was a young kid and couldn’t fully understand what he saw/witnessed.
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"He was a lot of things to me" "The only conclusion was love"