The siblings had to find a way to get through to themselves. They needed the closure of being together. They were here together, but they felt like they were distant.
As for jenny, Amelia knew she was responsible for that. She would apologize till jenny realized just how important she was to amelia. If anything, the only reason amelia came back to the goddarn city was to meet her.
She wanted to see her sister first.
She wanted her to hear the truth from her mouth and not any other person's. That would be the only way she could get her sister to trust her again. She needed jenny to understand just how important she was.
She needed her to see her as the sister who she had always been instead of the sister who had been selfish and had caused her so much pain. Amelia knew it was essential that she see jenny first because after meeting jenny, nothing would stop her from executing her next plan.