I think the problem from a character perspective is that she does nothing to reassure anyone that she knows what she’s doing, creating growing animosity that leads to a mutiny.
One problem with Holdo is that a lot of her original dialogue didn’t work in the edit and had to be redone with ADR and limited reshoots. The result is a Laura Dern performance of one version of Holdo replaced with different dialogue in a lot of scenes, and to me it’s a factor in why it sometimes feels off. Originally Holdo was more “spaced out and hippy dippy” in Rian’s words, and was supposed to be more overtly flirtatious with Poe.