Help, selling to an empty account?

I sold an expensive dress, shipping will be from Japan to the U.S. but I didn't get any message beside mentioning I want one first because I'm also selling on other apps. She doesn't have any reviews or listings herself, there's nothing and my intuition is telling me to cancel it for some reason. I'm afraid she will open a dispute to get the dress for free and after reading the horror stories of Depop siding with the scammers and seller lost both, money and the item... I know everybody starts from somewhere (me too) but I really have a bad feeling. How can I cancel it? Thank you