Is there a way to reset their state event? Not simply replay it but to actually change it?
EDIT: These don't work for 0.16 onwards, gonna try to make a similar save when 0.16.2 drops.
Nope, only way to pick another "route" is to load a savefile previous to unlocking said State. You should always save in different slots from time to time to avoid getting locked or to return to a previous point in case that you need to take a decision.
EDIT: Alright, went to the Discord server to take a savefile I had uploaded a couple of months ago. This save has the three girls ready to trigger their States. Gonna copypaste the "guide", as I'm unaware if you need to do them in a row (one after the other) or if you can skip one or two and try the next day. Again, as I did NOT test this possibility, your best bet is to do it one after the other.
Just download the rar file and extract it in the same folder the "game.exe" is located, load it and follow these steps below.
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So... in case someone wants a save that has the three girls ready to activate their State Events, here you go.
If you load the savefile, you'll be outside Vera's room. Martha's State Event occurs at midnight, just get up and walk to the living room. For Lucile just wake up, get out of bed (don't slack) and go to the studio/library.
For what States there are for each girl (except Mia) and how to get them, refer to the guide located in the 1st post of this thread, below the "Downloads" area. Take note however that you CAN'T get both Good States, you either get one of the Good ones or the Bad one."