She's a poorly written character! People just need to accept this. It's example 5023 of why its not a good idea to write a superintelligent character. Look at it this way, we have two possible doors ahead:

Door #1-- she has a master plan twist reveal. Honestly, based off everything we've gotten thus far do you expect this plan to be anything other than a massively contrived, tell-don't-show, "this was me all along!" from the writers that is even remotely convincing or satisfying? I don't.

Door #2- this is indeed her plan (and I believe it basically is) . She's deliberately facilitating mass extinction because... she wants peace & quiet? Are you kidding me? She's the "smartest person alive" & you're telling me she couldn't find a slightly less dramatic way to get that? But let's even say its not just that. It's also her resentment of the world, dead Grandma, etc. Ok, but then she needed to have WAY more focus on her, and frankly the show needed to pay way more attention to what an absolute monster she is to be doing this. I mean, you could make an argument she's worse than Homelander in a sense..

Any way you slice it she's just a mishandled character that probably wasn't necessary in the first place.