Emma is one of Hydra's maids.
Very little is known about her, besides that she claims to love Hydra and she hates spiders.
Emma saw "Mary"'s skeleton on Hydra's hidden room by accident, which Hydra never found out about. Due to never been found out, Emma is the only character who saw "Mary"'s skeleton who Hydra never killed.
She didn't change her views on Hydra after realizing that skeleton belonged to a human-born vampire. Rather, Emma shown worry once Hydra's castle was burning and Hydra was running away without "Mary"'s body and she also gave Hydra some piece of advice about love.