the fact that her huge ass mouth never seems to match reality; **** can only not come to fruition so many times before it becomes frustrating to stan for her. plus another weakness is as someone so intelligent, a lot of her work is really heavily unfocused. she needs a stronger sense of direction with her next music.
Being too over-the-top. That is her biggest weakness. Visual eccentricity & weird costumes and videos works for a bit before it gets boring and off-putting. Also, the GP does not consist of 3rd year art school students. She can ease up on trying to be overly conceptual all the time. Pop music is supposed to be fun and carefree.
Her ignorance (hypocrisy?) when it comes to some issues she's supposed to be an advocate of
Rare exhibition of the actual art that is still outside of her music
Her fans
Her hubris. I think she genuinely believed she could turn any song she touched to gold (though back in 2009-2011 this didn't seem so hard to believe) when it turned out that that couldn't be farther from the truth.
It's hard to find a weakness for her but I think I'll go with how stubborn she can be. Instead of "playing the game" like all of her contemporaries do, she often sticks to her guns and does what she wants which can lead to alienating people.
It's admirable, but I suppose a weakness in the commercial/business sense.