Yeah Tom, the big problem with this is that it really is not for you to decide.
She was under the age of consent and all you will be doing in this circumstance is asking her to confirm that sexual activity between you and her happened when she was under the age of consent.
Whether or not she was traumatized, does not absolve you of the crime.
Also, you don’t think that she might not be freaked out by you or a lawyer asking her about all this?
From what you have said, she was keen to get away from your world and made a good life for herself.
Why do you think she will react in your favor?