Lol at least, in the scanlation, you could speculate that Mama may have left to find a suitable soul(weapon) for Marco, but then the viz came out
It's more that Big Mom said she doesn't want to waste her soul(weapons) on Marco now, which means that
- Big Mom knows she can't beat Marco without her devil fruit
- She knows that fighting Marco now would be detrimental to her since it'd at the very least lead to her losing her main weapons
And it makes more sense tbh. I was wondering what kind of weapon Big Mom would find when she already had all her main weapons available on her(Promotheus, Zeus, Napoleon).