I can't believe the sitter sent your child to bed with no dinner! Was she super fussy? I know sometimes my 11 mo. dd doesn't want what I give her either, but did she try to find something else for her to eat?! As for food I feed her...
My dd mostly wants to feed herself, but is starting to let me feed her again if she also has her own food on the tray. I give her green beans, refried beans, noodles out of my stroganoff (veggie), a little cheese, graham crackers (she LOVES these and they have lots of fiber!), avocado chunks, wheat tortilla pieces, many of the things you mentioned, applesauce (but I feed her this), banana, small pieces of apples. Have you tried having finger foods and a spoon for her to hold and then spoon feeding her soft food. MY dd changes from day to day with her feeding habits, but this is working at the time.
As for the sippy cup, I usually have one with water available at her meals as well as throughout the day. She never finishes even half a cup, but she is getting much better about taking it. (She mostly likes drinking from my cup!) DD never really took a bottle, so I am really trying to get her to accept the cup for times I'm away. Also, as for having something with her meals, sometimes, just like me she likes water to wash it down, but I don't think it's a necessity?! Not sure about this one.
Hope there is something useful in my rambling here!