I have two 1600 Cupids. The first had a major flaw so I had to buy a second. Anyway, the first I washed out like I normally do. I usually wash my dolls hair to make it soft and brushable. Then I style it back to the way it looks out of the box, but without the gelled down look. Well, I could not get Cupid's hair back into shape! She looks alot like Sig. Cupid.
I learned my lesson. What I did with my second Cupid was dampened her hair so that the glue didn't wash out completely, and I finger styled her hair this time. The softened glue from the water re-hardened in the shape I made. She still looks stock:)
Not sure how you want her to look
You could try just dampening her hair first and see how that goes.