Would writing a letter to her be a way to approach it? I don't think she'd be able to sit and listen for a while given the things you've said. I don't think it's fair that you're baby has been ignored by the entire family, I can understand why she feels hurt, but for the whole family to do the same is just unfair. Yours was a planned and wanted baby, the timing might suck for your sister, but it was right for you. Have you always wanted three (or more) and she's known this? She's probably lashing our her hurt at you because it's giving her a focus. Good luck hun

And congratulations on your pregnancy!