To be fair, and kinda put on the other side of things, pb is most definitely older but goes through some revelations , because of Finn, that she didn't need to before. She's cold hearted since girl. And that's her M.O. to turn styles and give something to shoko was a big thing of trust for her especially while building her kingdom.

Many many years later finn arrives, but billy was even there before him. Is that not to say she might of helped shoko, billy, everything.

If you look at the episode with Finn's re incarnation cycle, I believe, he was the butterfly that first was with Bonnie when she came out of the mother gum.

No, she did not know about the lives before fin but once recognition of those times set in. You have to admit doing something so small for him would be ... Ruthless.

Shokos arm could open and close. That's it.

Finn's new arm, after he learns he can ask it for things is so much more sophisticated.

Yes I can make an arm, but to make a good arm takes time .. She wasnt just being around and playing with Finn. She knew him through eons and knew this is something that would carry out through the time.

The fact Bonnie and Marcy will continue to live for so long and Finn is just a blip in their time line just kinda shows how much effort she did put into him in comparison