why did she push him away ? i don't understand the last panel

I think she remembered that the 4th princess sa him, so she got spooked that she is maybe doing the same

... the other possibility is that she planned to push him down and subsequently became a victim of physics because "unmovable object" can't be lightly pushed down for snacking (so far she had the advantage of "imma mount him" and him just being so utterly dumbfounded that he didn't even fathom defensive tactics cause...[why would she do that])

wait when did she find out about that..? I can't remember

chap 114.
the princess told pereshati that they spent the night together.
and pereshati had a heads up from the assistant before about theo's strange behavior toward women after his visit from royal palace. so she knew something bad happened between theo and the princess, but dont know the exact details. also the red strings symbol.

OHHH okay thank you!!