In one of the chapters when she was getting a confession she didn’t but she was about right before erise intersected the conversation and to the chapter that came out today wasn’t she suppose to come with the knight and it was said that she was there at the temple where erise was so she dropped the knight to go to the cp
Saying sorry is at least acknowledging and she never greets erise as a noble even when there alone everyone saying because she a maid and doesn’t know any better but she lived in the place and never bothered to pick it up she is choosing to be like this also she never acts like one nor a commoner (never does actually maid work mostly only sleeps where maids sleep)
So she talks about her mom in chapter 24-25 or 23-24 it one of those. And In both chapters 2-5 (since she doesn’t make many appearances yet) she tried to tel the crown prince that it was her fault and not to blame Eris and again in chapter 5 when he slapped her. She realized that she should’ve done more as well (the chapter where she apologized) but her past trauma and her position don’t let her do such a thing.
In the past before Eris was possessed by the current Eris(I forgot her name lol but the Korean girl), she scolded Helena for not greeting her as a noble in private, but in front of the Crown prince, eris told Helena to just greet her as a friend, hopefully that clears things up. Rmb, original Eris is seen as the villainess in the novel. Secondly, Helena isn't able to do maid work because she is at the beck and call of the prince and the prince scolded/slapped(because he is a dick) the head maid for giving Helena work to do. Thus, Helena has no work to do because the head maid is threatened basically to not give her work to do.
https://yoloarchives.wordpress.com/2021/05/15/ktv-1/
There's only 2 chapters translated but if u want spoilers:
https://forum.novelupdates.com/threads/kill-the-villainess.118265/
I don't think she goes to the cp I'd like to see it as the cp forces his way through her place and demands like the baby adult he is that Helena goes as his companion. Also the whole confession thing by Mr. Knight was disguised as a knight's vow by Knight dude. Eris knows this, because she read the novel. Helena doesn't, because she never read a novel.
SHE CAN'T SAY ANYTHING BECAUSE SHE'S TRAUMATIZED BY WHAT HER MOTHER INSTILLED INTO HER SINCE A YOUNG AGE. THE CP LITERALLY SLAPPED THE HEAD MAID FOR GIVING HELENA WORK BECAUSE HE THOUGHT THE MAID WAS LOOKING DOWN AT HELENA FOR GIVING HER WORK EVEN THOUGH THAT'S LITERALLY HER JOB. Helena knows her place. She knows that anything she says isn't going to be acknowledged by the cp because he just wants her to look pretty and stay silent. Saying anything that could so call "benefit" eris isn't going to help either. The men around her are too shady to believe that eris has any redeeming qualities worth talking about by Helena of all people. They hate eris too much to give a flying fuck abt any good things Helena may have to say about her.

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.