1) The Off Topic rant, which was about 30 minutes mind you. Basically, the podcast is supposed to be fun/entertainment and light hearted. Even when they talk about some serious or semi serious things they never spend a lot of time on it or they don't go too far into it. She went way too far in her rant and people disliked that. On top of that some people simply just disagreed with what she said, so those people would be even more upset while others would just be upset because she messed up the flow of the podcast.

2) Her dad is famous and people felt like she got the job based off of that, or got an unfair opportunity and was judged unfairly based on her last name.

3) She is a streamer. They work by themselves and that's what they are used to. That led to an awkward/disruptive/non group focused personality while playing in a Let's Play with the AH crew. That's not a problem by itself, all the Achievement Hunters had to learn how to play in the group dynamics when they first started. But after the Off Topic rant, nobody would even give her the chance to learn.

4) Her personality is annoying to some. It was a similar thing with Meg. I don't know how well I can describe it, but it's just that she has a big personality that a lot of people don't like. It's like how all the AH crew has something that people find annoying. She has her own which was made worse by her being new, trying to learn how to fit in the group, and the Off Topic rant.

5) And lastly, she publicly said that the stuff people wrote about/to her upset her. That was a huge mistake as it opened the door to everyone that disliked her to keep it up as she admitted that their attacks were working.

Really, it was a bunch of stuff that all came together.