I agree, she freaks out in that scene, afraid that what just happened might hurt change their relationship.Which was a surprise for me since it felt like they kissed so often in the recent update almost as much as the MC slaps her ass throughout the entire game. It was a welcomed surprise tho. I do think her sudden change is because while she freaked out prior to that , she might start to think she needs to allow things to move forward if she doesn't want to lose him and get out of her own head for and not to worry so much around him. After the end of episode 11 I feel she started to realized he does actually care for her and respect her boundaries .
But the MC manages calm her down and convince her this was a good thing, a natural thing, and the scene ends with her happy and playful, teasing each other and sharing secrets.
Which carries on into episode 12 and how she's a lot more relaxed about these things.