We don't know if she has adv haki.
I would say she's around the same level as WW or maybe slightly weaker than him. Yes, she may deliver few hits to Kaido but that's it.
In this chapter we found out that she will fight 1vs 1 Kaido, that is why I believe she will do less than Luffy did because I'm confident Oda will never portray her as stronger than Luffy.