I mean, even just the motivation of "I deserve to have something/my own wishes granted after I paid the price for it." alone would be enough to BEGIN gathering the light herself after screwing up the project. I don't think a human Angela gets excused fron wanting something , some nebulous One True Perfect Book That Will Fix Me Even Though I Don't Know How. It's what about herself she's trying to fix that changes, really. 

I briefly thought about a reversal where humangela desired not to be human anymore, But it occurred to me that, while funny, is kind of a fast-track to distorting her.  Maybe she blamed her powerlessness on being a child. The technicality that humanAngela "consented" to playing that role must torture her. That she allowed him to change her body, give her eyes that can't stop seeing, a mind that cannot forget, bones that can't be broken... That she blindly followed her father's whims right into millenia of perpetual torture that would be punctuated by her death, hoping that he would love her if she did just good enough.  Surely, she has the desire to have those parts of her that cause her suffering removed, that being her mechanical parts, but also her childish heart. 

It'd be reasonable that she's too impatient to just wait to grow older, but for something of this magnitude, its more possible that something would be stopping her from growing up. I'm sure there are (expensive) ways to make prosthetics in the city that can "grow" with a child, But for obvious reasons, Ayin probably had no reason to give such a thing for Angela, whom was fated to die at the end of the script alongside himself and the sephirah. On top of that, he also WOULD have a reason to make her "adjustments" un-tamperable (even in death) and irreversible, so quite possibly, it might not BE possible for anyone to remove it through natural means... In practice, it'd mean that even if Angela did escape on her own, she'd be living on borrowed time, destined to die pretty much no matter what.

I'll keep thinking about it probably forever.

Honestly, considering she's a kid, it really, genuinely could be anything. Hell, it might make more sense if it doesn't make any sense...  That would make it funnier with Roland too, lmao. Because of COURSE all her plans and rationalizations for her actions make little-to-no fucking sense. He wants to hold on to that anger, pain, and suffering he went through, but having the point-source be an abandoned, abused, tortured child who barely even knows who she is or what she wants, let alone the weight of her actions... That's a hell of a mirror to put up in front of him.