I don't have any hope of convincing you, but I'm going to respond anyway.
"Going to drain her" is not the same as doing it. There's a reason she doesn't look like she's struggling, because Oda has conveniently allowed her not to fight. Read the text, Yamato not fighting is a key fact in the whole chapter. Without it Momo's little fire blast means nothing.
She's bringing up Luffy because the other key fact is Luffy not helping. It's not because Luffy is needed, but because the plot needs to emphasize that Momo refused Luffy's help.
What happens with Yamato is the only way to have her be at the fight scene and not actually fight.
let me get straight, you say Yamato is not fighting, yet she got trapped. Why she would be captured by greenbull ?
‘’Don’t self defense when someone try to kill you with your logic.
‘’Yamato say she need ouffy and his friend help to defeat greenbull, not Momo.
Momo didn’t stop greenbull, it is shanks and his crew stop greenbull
Has not shanks stop him, Momo and his friends would be dead due his dumb pride.