there are so many different things that determine strength.How you people can call madara a sexist is beyond me cos unlike fairytail were clearly ezra is one of the strongest characters thus. Making her gender irrelevant in naruto this is not the case apart from chiyo every other female character in naruto is considered weak in my opinion so basically madara is telling the truth I mean she is the hokage but there is no way she tops naruto or kakashi her village was getting destroyed while she waited for naruto to return she is weak its that simple
she healed the entire village and saved tons of lives using up almost all of her chakra. + medical ninjutsu takes tons of chakra and skill.
I think shes pretty damn strong if you ask me. kakashi couldnt heal the entire village nor save that many people. neither could naruto (directly). he did it indirectly by defeating pain, but thats different.