She was mildly blinded by an attraction to him. The second the truth of his intentions were clear to her, she smacked him down. Hard.
Or? She may have been playing him the whole time and was just waiting for an opportunity to put the screws to him. SHE, after all, was never forced to give a Lasso-induced confession as to her intentions.
I actually liked both her look and her personality. Add the fact that she so easily thwarted someone with the Power of Zeus, and that's a pretty strong testament to her power and intelligence.
Now Hippolyta, on the other hand? Yeesh! She may actually be less likeable than New 52 Hippolyta!