I also think Arohi will try to take revenge. Family's acceptance, adoption truth(this is so confusing tbh) and Arohi's increased hatred for Akshara which would make her show darker shades of grey are the tracks on our way. She might act like she is ok with Abhira's marriage only to do a bigger drama to avenge herself.
The girls being half sisters and their mother's death affecting them should have been revealed during Abhi-Aru's alliance itself tbh. Its a big deal for the sisters that can't just be hidden from the people who are going be a part of their girl's life from there on. Especially the groom should know this.
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