Communication is one way that she will be able to express herself and you have an opportunity to talk things through, help eachother to process, acknowledge, move past the things that have happened.
If you do nothing, the resentment can grow.
Try less direct ways of communicating. Sometimes verbal conversations get all twisted and out of control or too emotional. But emails can be a way to digest what she writes and think carefully about a thoughtful and supportive response.
If she hates you - there's reasons why and they are valid to her (even if they seem outrageous to you). You first have to ask questions and listen carefully, repeat back and empathise and be compassionate to validate how she must have felt and why it would have been hard for her. Deeply acknowledge and validate it with more than just one or two sentences. Then if you feel that you need to explain and apologise, that would help. She doesn't know your side most likely. The explanation you can give for why things happened a certain way can really help her to understand you. But the apology and acknowledgement of how hurt she feels is also important.
But first need to ask many questions to get to know why she feels this way. And ask more follow up questions.
If she's going to heal and move past it - she needs to get it all out and express things to you properly. If she just touches on the topic, and you don't ask further and simply just apologise - it's not enough to take the hurt away. Ask more, discuss it further and think carefully about what to say before you send the replies. Try not to assume anything about her - ask instead. Try not to label her or use generalisations like "you always do XYZ" . Use kind words and give thoughtful replies. Even if you are angry about what she writes, you can reply "I want to take a few days or more to process your email and I will reply soon, I love you" and then think about it for a while before responding.
