Comments of chapter undefined of The Black Mist Enchantress

I wish I could make sense of this. So, we have 4 girls with something strange going on 3 years ago: Emma, Lamia, Agrona, and Lady Vilmon. Alex never met Lady Vilmon or Emma 3 yrs ago. Is there any way Lady Vilmon and Lamia are the same person? Whether yes or no, could Lamia have entered Emma's body during the accident...🤔