2 things I wanna mention.
1: Saitama once slammed a table with his fist in rage and it did nothing. Maria slammed a table with her fist in yandere fury and broke it in two. The conclusion we can draw from this is Maria is even more physically powerful than Saitama.
2: Her room is decorated with pictures of Streamer covering every surface on every wall. I assume the others have similar decor tastes as well.