What are you using as a treat? it may be she doesn't actually like the treat all that much but she'll eat it.
I was told an excellent idea in which you get a bowl of different treats and let the bird pick one out of it. Repeat this a few times and if the same treat is taken every time then this is your bird's most likely favorite and you then use that as your training treat and ONLY use it for rewards.
It'd be helpful if your bird has been introduced and has eaten each type of treat you have tried.
Also, try the training in the morning or evening, or whenever she normally gets hungry. she'll be more willing to receive food if she's a little hungry.
if you can't get the bowl close enough without her shying off, replace it with the food bowl, then swap it back as soon as she has taken something from it.
if the fear is still a problem, try talking to her about anything, but if you include her name it usually gives more interest, then leave her again. just talk to her for a few minutes at a time to get her used to you and if she looks more settled, give a treat to show her that it's the correct behavior. something like that. do this in short bursts, perhaps every hour or when you can so she starts to learn that you are not going to harm her

if a bird is scared and wants you to go away, it is only going to get more frightening if you force your presence upon her. Thats what i've read, and it sounds about right too.