It's important to note that we (well, most of us) are genealogists, not trained historians. In the case of famous persons, I believe that we should outline the facts and then refer to authoritative sources for the interpretation of the facts.
I think the bio is fine for the purposes of WikiTree, although you might want to clarify that she spied for the British not the Colonists. Or, you might want to remove that entirely; historians differ on whether or not she was the provocateur in the Arnold incident. That's an example, in my opinion, of an interpretation of the facts that should be out of bounds for us.
I believe that the best way to elaborate on the profile is to refer to some scholarly works. At minimum, it would be wise to provide a link to her page on Wikipedia, which cites more than a dozen scholarly works.
