Sasha, you are only NINE DAYS into motherhood! You're allowed to make mistakes and learn from trial and error, you know -- we all do!
I suspect that you have caught the oversupply problem early enough that it's not going to take three months to resolve. Just be careful from now on not to needlessly stimulate milk production through pumping, and chances are you will quickly see some improvement.
I also want to reassure you that Sophie is doing okay. She is so tiny -- she doesn't know about pumping and OALD, and I'm quite sure she isn't going to hold any grudges over anything. She is learning right along with you, and will be your breastfeeding teammate for months to come.
Be patient, especially with yourself, okay?