
I don't know why you guys hate her but for me, what she did was honestly reasonable. In their perspective, the mc is still weak since he just woke up from a coma and had always been ill. Although she has an attitude, she was persistent to protect him and the others from danger. She is not dumb or a brat because the mc has not yet shown his real power to her until later. Just because the mc showed his skills and abilities to us, the READERS, it doesn't mean that all the actual characters know it too.

ONLY us, the READERS, know about the mc's true self. The girl never knew about him and only knows from the rumors that he is a sickly boy since he was a kid, a person who is not blessed with mana and she also thinks that he still does not have strength since he just woke up from a long sleep. So it was just ok and maybe a great idea to stood up on the way of the mc as she knows that she is confident in her strength and the other people needs it in order to save them from that bastard. The girl seriously did a good thing. YOU ALL JUST HATE HER ATTITUDE BUT SHE DID WAS RIGHT ╮( ̄▽ ̄)╭

that was reasonable but still annoying
╮( ̄▽ ̄)╭ she went out and took the spotlight because she knew that she must protect and save everyone from that bastard. the girl and everyone have yet to know that the mc is strong and powerful so we should not hate her first since what she did was right (づ ̄ ³ ̄)づ the mc only showed his true self to us, the readers, and he does not yet reveal it to the actual characters
for me, romance is good to have a little spice or make the pace change a little but if it's harem... nah ╮( ̄▽ ̄)╭