Hi!Nah, it's probably her way to emphasise that they need to finish their short encounter because they both have other duties to attend to and they won't have time to interact with each other until a later time. Sophia is too important for Abel for her to be discarded, Chuck won't touch her until he will win with her in chess (which shouldn't happen unless he cheats), Kathleen relies on her too much and August doesn't care.
I agree with you on this, both are needed elsewhere, Sophia with Abel and Edwin has to lead Elias to his doom. I too see this emphatic goodbye as a facet of Sophia´s personality, who has problems with social stuff due to her eccentrism and how she grew up. Given her problems with social cues it seems to me she wanted to make sure Edwin gets her feelings. She also touches him when she is saying goodbye. We also have this gem of socially imept nerds flirting:
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