Yep, it's unbelievable. I mean, her first mate has advanced CoO and awakening while Big Mom only has ACoC.
Oda really wanna tell me someone like Big Mom, with lots of battle experience and life time, couldn't awaken her devil fruit? I am not against Kidd and Law beating Big Mom but it is just really wasted potential, especially seeing how Big Mom gets defeated without demonstrating awakening at least.