[...] I guess you could blame her for preferring improvisation over extensive planning that probably backfired and is causing all these complications. But it's not from the lack of commitment but is probably the case of biting more than you can chew.
Personally I don't think that Eva went into this without extensive planning beforehand; at the very least she probably would have had a good plan for where she wanted each route to go, leaving room for improvisation and small changes where she saw fit. That's just what I assume from how generally 'together' her writing has been up to this point. Of course, knowing writing, things will only get more complex and I can't imagine it's easy to go chapter by chapter without constant revision to keep things tight, even with a good plan.
I'm not sure if it was similar with GGGB because I wasn't paying attention to the development of the game, but there was something I noticed right from the beginning of ORS: Eva's Patreon tiers don't allow for any real (significant) influence of her Patrons over the content she's putting out, but rather gives the illusion of input. I don't mean that in a bad way, it's actually a positive thing in terms of creating a solid game - if you're constantly catering to the whims of followers/Patrons then you end up with a game that's generally all over the place, and loses its focus as the dev(s) strive to please everyone. Follow a good plan and you're going to get a much neater package in the end.
Where she does allow influence it seems to be either minor, like modifying Ian's clothing when people weren't happy; an illusion, like people voting in polls that makes them think they're dictating something when it's probably more about Eva understanding how her content is being received; or constrained to the highest tier, which allows for a one-time minor cameo of a character that the donor creates that will be completely dictated by Eva.
(I think Milo may have been one such cameo character, seeing as (iirc) he looked specific but a bit out-of-place next to the other characters, even as someone who was part of Allison's life; we probably won't ever see him again.)
So yeah, I'm guessing Eva has a lot more planned out about this game then we know, and the improvisation is more to allow for room to move depending on her mood/feelings as she goes along.
I wouldn't be surprised if it felt overwhelming for her though. Not only the pressure of expectations to deliver, and be equal or better then GGGB, but also the far greater size of the project compared to what we got with GGGB. I really do hope she's still taking some time to chill on the daily, among all the pressure she's probably feeling.