Did she spam it when she coudl of easily hit manda when he was off gaurd?? no so its insinuated that their is a cooldown and there is only a certain amount of acid inside people. If acid is spat up then the chemicals to reproduce it need to work to create more. but think of it how you will.
-I did suggest that her punches were disgustingly strong so no argument there
- Acid minipulation said that already
-liquification said that already or slimification 
- I was going to add sensory abilities but i was too lazy to write it out
- She would be immune to genjutsu regardless becaus eof the natural energy and chakra control. Genjutsu isnt working on SSM
- Clones i put that of course thats a good power
-By transformation do you mean turn in an actual slug i cant rememebr
FOr one MAnda moved towards her then she split, secondly, there were other summons involved, and you can assume it was a cool down period unless the manga says it, or I can say there is a time frame between NAruto making the Rasengans.
Classic a by product of the little liquefaction thingy
Because its just as famous doesnt mean he has it, its a speculation and people say this because they are related and because the marks look the same but what people fail to see is that the marks symbolise things completely different. Her marks represent Byakugo and his rep SM.