My Daisy was just like that - the whole shaking and cowering - and she has slowly, but surely has started to come around.
She is fairly use to me and doesn't dart away very much, but she we'll sneak up on my husband, will even stand up behind him, just looking at him - but as soon as he looks at her she trots off so she's about a couch cushion away from him and will usually thump. Although she will take a treat from him now, she still needs some time.
Sasami is very right about petting. Charlie loves his ears and nose rubbed, so my husband will try to pet Daisy the same way, but he ends up scaring her in the process. She seems to prefer the side of her rump rubbed - very gently - I will even hold my hand there while she sits next to me, she seems comforted by that. Just pet her in a few different ways and try to read what she likes and tolerates best. I like to lie on the couch with her right next to my chest so she hears my heart, and she'll stay very calm and almost fall asleep. That's how I first got her and Charlie to lay together because I've always taken naps like that with Charlie - needless to say he got jealous and wanted to lay with mom too so he put up with the extra bunny.
I think that's excellent that she's bonded with Oscar. My two play and respect the other's space, but are still a little ways away from being really smitten. You have half the battle won. Her affection towards you will come in time.