1. If neither of them helps, then do your own thing. If they just don't like each other. Deliberately ignore each other. This is the safest and most reliable, because after all, you are roommates, and it is not good to be partial to anyone. Of course, if you just want to help one of them, it's another matter, but if your relationship with them is similar, you should treat them equally and don't take part in their war. Just be yourself and don't gossip about anyone.
It is wise and humane to help relatives instead of them. If the two of them fall out because of one thing, if you know the truth of the matter and who is the right one, then you will have a steelyard in your heart, know the ins and outs of this matter, and know who is right and who is wrong, but don't fight with the wrong one. If you think you are a wise problem-solving helper, you can talk to her alone and gently let her realize her mistake. After all, the dormitory is not harmonious.
3. Make a joke properly and solve this problem in a targeted way. The discord between them will also affect other people in the dormitory, and the atmosphere in the dormitory should sometimes become solidified. So we can gossip and talk about topics that girls are interested in when everyone is in the dormitory, but we must bring them both in and don't ignore either side. Maybe they will give the dormitory people face, or they will make up.