Go to the city center and shout out loud: Open Sesame!!!
If that doesn't help, then make Sasha and Elena your girlfriends and watch their "fight" at the sleepover event, then go to the cemetery and do the quest there. Tadaaaa, sesame opened.
You don't need it, you just need a little program, named unren, which can be found on this forum. I know that everyone wants just an easy solution for everything, but work for your "easier" gaming.
And when you visited every bathroom, you'll be surprised that she is not in any of them, cause she is in the
The mansion is quite a mess at the first time, but belive me, you can find your way after a few time using it. I can find every room I want to go, without a map now.
You installed a mod (which was a bad idea), or some older version (which was bad idea), cause the new version got rid of the menu.rpy, instead there is a menu1.rpy and menu2.rpy, but they have the same labels as the menu.rpy had.
RenPy won't allow that, so you have to delete the menu.rpy and the menu.rpyc.
And when you downloaded and extracted the whole game again, the problem wasn't solved, because the extract overwrites just those files that exist in the .rar, and the menu.rpy is not one of those, so you have to delete that manually.