Nope, just the truth.
Look at the facts.
Big Mom saw Luffy injury Kaido.
Yet she didn't warn him to evade any of his stronger attacks.
When Zoro prepared to use flying dragon blaze Big Mom freaked out and told Kaido to evade it.
Even though Zoro didn't prove he could cut Kaido until the following chapter.
When Zoro did cut Kaido she was surprised.
That means Big Mom was concerned about Zoro injuring Kaido who at the time haven't proved he could cut him yet. There would be no reason for her to be that concerned for him unless the manga implied the attack would cause him significant injury. Since Big Mom body isn't hype up to be invincible like Kaido's body that mean an attack that can cause significant injury to him would cause even greater injury to her.
:cheers: