She might have been slow to realise is in spite of all of her interactions with both Yuuta and Rikka of late, but a shocking fact has suddenly come crashing down upon Shichimiya - the realisation that she's in love with Yuuta.
Given Yuuta's "contract" with Rikka, Satone knows that there's nothing that she can do about the situation and thus tries to rid herself of her thoughts and feelings