It was clear before they even had the big rift, that her relationship with her father was complicated and that he was potentially troublesome. I remember him saying something like, "When I spoke to Harry on the phone to give him my blessing I told him that as long as he doesn't raise a hand to her, I have no problems". That was a pretty low bar.
And in retrospect, a lot of people have pointed to a few gushing posts on her TIG website about her dad but those just scream, "desperate daughter trying to pretend things with her dad are better than they are."
Similarly, he claims he paid for everything and she lived with him etc, but I'm pretty sure that's been shown to be completely untrue - not least because she went to school in LA and he wasn't even living there at the time!
I suspect that the fall out with the wedding and the knock on effect was the final impetus she needed to properly cut him out of her life after years of being messed up. There are 1000s of women just on MN alone who can testify to the negative impact of a shitty father like this on their DC and how long it can take the DC to properly move on.