Pretty sure she genuinely thought (or fooled herself into thinking) she's just missing MC as her best friend. It was only after hearing his confession and seeing him later, that she actually connected the dots or stopped unconsciously lying to herself.
Then she does what she usually does in this situation: panic. Not surprising especially if MC is now in relationship with someone else, and it doesn't surprise me she isn't immediately jumping back to talking with MC as if nothing has happened, either. But i don't think that's going to result in trying to block him out completely. She just needs a while to find her bearings. (and DPC is milking this for his usual cliffhangers)

.
I really don't get this part, what makes you think this is what she usually does?. In Interlude we control her, and if anything she comes out as a Rebel, kind of a Bitch attitude girl, who find it cringe to talk about feeling.
During San-diego she not goes through that much of a change at all, she get piercing and tattoo, and that is all. Oh Yeah, She kind of realize she miss MC, and looks lovingly at the drawing she draw on the buss.
in episode 9, she comes as some full confident badass chick , full of life experience, what we somehow not see in her own episode


and every one of the Diks drooling over her, while she constatnyl show How mature she is now, by lecturing MC if he fight, she not smoke weed anymore, because Mommy was right it was just a phase etc etc, while She constantly Eye Fucking MC.

what is heavily indicating She wants the D of MC.
and then she comes out differently again in episode 10, and now you say this is how she usually behave Panic, in what universe in what game ?!
POOR WRITING BY DPC, this is what it is, She should have never Returned.
Unless the only point for her is that MC now have a partner who he can Read off his Mother's Diary


.