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The clues are the ruler with the 1.6 mark and the multiplicity of spirals in her office.

You can ask her about the spirals, she will talk about the Golden Ratio, also known as Phi.

In her sketchbook on the table on the bottom of the room, you'll find a note that gives you the last information you need ⋅w⋅

I know noilol1 already answered, but in case you wondered how you're meant to find about it, here it is ^w^

I got that too! Only managed to make her jump one time though and it took me by surprise but I'm sure my eyes did not lie to me now. This chibi popped in the middle of the other words after I clicked a word I though would apply to Yuri (I chose to help Yuri for the festival and stuck to it through the end).

I also got Monika's chibi jump from out of the screen. I'm certain it's Monika and not Sayori because of the white bow on the back of her head that I clearly saw. I think the word I clicked was "alone" (I don't recall it showing up somewhere else in these mini-games)