@321zigzag1: Looks like blood to me, she also didnt have that nice bruise on her face until after Sakura decked her. Best regeneration I can recall is Juubi Madara coming back from a gaping hole in his gut after Night Guy. Still nothing that implies Kaguya coming back after every part of her including all her organs being turned to paste if she takes a punch from Saitama. Or Saitama can just punch her straight into the moon for after hearing Zetsu ramble on about her story to essentially accomplish the same act as sealing her.
I still think her immunity to most jutsu has something to do with it. Juubito was no-selling everything until Naruto resorted to Senjutsu. She could have even more immunity to jutsu altogether and and thus split durability, since her resistance to plain physical attacks is just pathetic. I agree w/ speed equalized it can go either way, especially if Kaguya can actually play smart.
The blood was from Kakashi's raikiri which was enhanced by remains of sage of the six paths chakra Obito had before he gave them to Kakashi. Kakashi of course used kamui in conjunction. The immortality part is a speculation on my part but it makes you wonder why she had to be sealed and stripped of her powers if nothing else seems to work.
She didn't absorb or neutralize the 9 bijuu sage enhanced rasenshurikens. The fact the bijuu within her reacted and came out proves my point she just flat out tanked it and she got hit by them unscathed.
As for the bruise part, again goes without saying how it seems to be bit of a inconsistency. She had no problem and Naruto cut her arm off or when Naruto punched her with 5 tailed Bijuu's enhanced max strength overpowering Kaguya's chakra arms.
What's even more ironic is that Kaguya first appearance she blitzed Sakura too.
Finally when Kaguya had her arm cut off, she was in a midst of recharging, she seemed to be low on chakra which decreased her speed and strength. Black Zetsu did note later that absorbing more chakra put her strength and speed on a higher level.