Why do you not have enough sanity to kill that one Momoko? I have no idea how you're playing this game but you're clearly doing something very wrong to be able to lock yourself out of the game like that in such a specific, weird way that no normal player would ever play it like that for it to even become an issue. Besides, you get free soda from one of the trashcans, so even if you somehow can't afford to buy items and you have run out of all sanity, and made it so that Momoko is blocking your way, you should be able to recover enough to defeat a single Momoko there and then just solve the mirror room puzzle like you would normally. If you still fail even after all that, that's on you at that point, lol.
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The problem is that on my way out, I ended up with multiple Momokos. And I was kind of trying to see if you could actually hardlock yourself with some effort. It is very much possible if during chases, you attack a lot more than you should. Also, the fact that Momokos respawn when you re-enter (if you don't kill them) doesn't help.
As you can see here, the Momoko is facing the other way and she never turns around. This makes this Momoko unkillable because you can't kill her from behind. This means that this Momoko prevents you from progressing.
You can only kill Momoko if she is facing you or you might need a certain amount of stamina/hp, she doesn't turn around, and she doesn't seem to otherwise respawn.
(And as for another bug... that mirror image....)
Did you figure out why that Momoko gets stuck facing one direction as well?
See, I love games and hate bugs, so I try to find problems so that devs can fix them. It wasn't really meant as a proper stream, but more of a proof of a bug's existence so that you can see the problem and maybe it would make more sense to you.