On a playthrough i went only to the side LI (Cassandra and Jenni + the Ember women) to see if it changed anything to the regular LI always being thirsty for the MC (and it changed nothing, sadly poor Mike is still completely ignored).
I noticed after accepting sexy time with Cassandra then obtaining the camera from Kate, then after taking a photo of Helen with her phone, she'll say :
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the MC replies "When ?" and Helen :
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while after the MC is saying nothing (as he just had sex with Cassandra) , Helen will add
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with her usual smirk so she's just playing with the MC and does not refer to the forest event at all, that seems to hint that
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SHE KNOWS !