well he technically didn't pass on it because it became pretty clear to me that he would probably just mess it up if I DID offer it but long story short I currently possess several cases of the one thing in the entire multiverse that might actual inspire Ignis to forgive Stark if that possession were to transfer to him

And if that didn't convince her without Summer having to reveal her hand entirely, she thought she'd also throw in one last point:

but mybe i just keep it for myself who knows when it could be in handy for a really big favor

As if Ignis didn't already owe her a TON already, but Liliana didn't know that!