The Kitchen Daughter by Jael McHenry
Ginny has Asperger's, and one of the few things that calms and comforts her during times of stress, is cooking. So when she's trying to cope with the sudden death of her parents by making one of her grandmother Nonna's recipes, and Nonna's ghost appears in the kitchen, she's not sure what to think. Is she being cursed or has she got a gift? One thing for certain, she can't tell her sister Amanda, or she'll certainly have to move in with her and her family. More importantly, what was the message Nonna was trying to tell her, just as she faded away? Whatever it was, Ginny knows one thing - she wants to be left alone to find out and take care of herself, no matter what Amanda thinks.