Please understand that though what she is throwing out at you does sound like an excuse based in fear, please understand that the fear and the anxiety are very real for her. If she looks panicked and she sounds panicked, believe me, she IS. I bet were you to put your hand on her chest, you would feel her heart hammering.
Your wife is going to have to learn to 'forgive herself' and she is going to have to learn that YOU and the physical closeness you want with her are not the enemies. Her enemy is her fear and her anger. Those emotions are relics from a defense mechanism she learned as a child. Though she has passed her trauma, the defense mechanism is still there. She has to unlearn and involuntary response she doesn't even know she has.
You need to go slow with her. Tell her what you would like to do, and you will only go so far, period. If at any time she feels uncomfortable, she needs to tell you so you can stop and talk about it. You really need to understand what she is going through and help her deal with it.
She has to learn that she has a choice not to feel fear or anger (and this is damn hard). Or, she can continue with you despite her anger and her fear. You may not receive the best lovin' you've ever had on your end as she deals with this, but if the two of you can talk while she struggles through it, she will learn that the only way she is ever going to rid herself of these feelings is to refuse to give in to them.
Conversely, though, you can't push her. Find your deepest reserves of empathy and tolerance, 'cause you are going to need them. You can do this. Just make sure you talk with your counselor, too.
