That is deadass the whole point. Helena tried to tel the crown prince that it wasn’t Eris fault but he still went and slapped her. When the maid got in trouble by the crown prince, Helena once again tried to say it wasn’t her to blame but the maid got blamed anyway. Helena deadass said she could never be angry or mad at Eris so there isn’t anyway she would purposefully do anything to hurt her.
I dont like Helena, but I dont hate her either.
She knows Eris situation, but like you said, she can't do anything.
But I respect the fact that even though Eris might do mean things to her, she would forgive her no matter what. That takes a lot. Although, I do get annoyed with some of the situations the girls get put through, like their forced tea party, or this one. Where they are both wearing the same dress, and the prince walked in with a maid-
From the trauma her mother instilled on her growing up and telling her she needs to be a damsel to be liked, to the men never listening to her when she does speak up. No matter if they are kissing her feet they don’t see her as a real person considering her words are always left unheard. When she witnesses them being outright rude to her, she always tried to help Eris. They usually do it when Helena isn’t here or in a way she wouldn’t understand since she herself grew up poor.
Leave as in do you mean leave the Crown prince? She can't escape her situation, the cp sees her as his** possession, and she has no place to go either. Saying sorry to eris doesn't help either, it might even seem condescending to her. Regardless, Helena is in a position where she is unable to do anything, and she has no other person on her side besides those wanting to "own" her as an object and not treat her as a person

She's wearing the same dress cause the crown prince made her to. In the novel, both girls didn't know they wore the same dress and eris was supposed to arrive later than Helena due to waiting for the crown prince, arriving and then seeing the situation then runs out in embarrassment. This time however, Helena runs out because she had no idea eris was wearing the same dress. Honestly, how would she have known? Helena is a maid for crying out loud she has no resources to get a dress of that level. Remember, she is a maid, she is powerless and for goodness sake stop hating on her start hating on the 3 mls instead.