Oh, I'm surprised and glad that she's adapting quickly; I'm also happy that she's smart, mature, and righteous enough to recognize her mistakes, proud of the big sis <3
I was a bit worried in the previous chapter because she was way too hostile, and I didn't know if there was a good reason for that or not (it's valid to reject the relationship between him and her younger sis, but hating on him was something that wasn't justified enough just because of getting pregnant and dying IMO). Now, seeing that the ML was deeply hurt after her sis' death, I can completely tell there was no reason to treat him like that.
I'm happy with this development, ty for the chapter. uwu