Yes, very normal. I graduated uni about 5 years ago, and there were constant arguments, people getting worked up, accusations flying.
It's important to remember that for most, this is the first time they have lived away from their family, and therefore they have to live with new people, who do things differently and have different expectations. All it takes is one person expecting the bathroom cleaned immediately after every use and someone else happy to do a once a week deep clean and everything kicks off. A lot of the teenagers haven't yet worked out how to navigate these situations on their own.
On top of this, they are all under immense stress with the change from high school to uni, even if they seem to be coping well. It's a big difference in terms of work, motivating themselves, teaching style. Even if your daughter is coping well, others may not be, and may be taking out their frustration on the only people nearby.
I also think it's important to remember that the people in your flat first year are normally chosen by the uni pretty much at random. Whilst it's good if your daughter can get on with the people she lives with, a lot of my friends ended up in flats with people they just didn't mesh well with. They made friends of their own choosing from their course, or from clubs they joined, and then moved in with them second year. Everything settled down after this. I think a lot of people hear the stories of students becoming lifelong friends with their flatmates from first year and have a romantic idea of an instant connection and lifelong friendships, but it really is luck of the draw, as nobody gets on with everyone.
Finally, teenagers are a dramatic bunch at the best of times, adding free reign with alcohol, a cramped environment, hormones and all the other things they are dealing with and it's miraculous that some of them make it through uni unscathed.
I would recommend reminding your daughter that she will be living away from them soon, and doesn't have to speak to them again if she doesn't want to, and that not everyone gets on all the time. Encourage her to join a club or society if she hasn't already, so she has another group of friends that she has chosen herself. I would also strongly recommend making friends with people off her course, as they can be a massive help with assignments and group projects. Reassure her that she is in no way the worst person ever, frustration and alcohol makes teenagers say and do stupid things. It's hard when people tear you down like that sometimes, but being the bigger person really does help, even though it's hard at the time.