on a legal basis, there are no strong grounds for a rape case here
on moral grounds, you actually cheated by putting up a false ad to look for a model
if I'm the woman, I will report the police about your cheating
it will be easier to 'kill' you in this way than to accuse you of raping her
you can choose not to pay and ignore her
just hope, she won't call up any gangster to beat you up - I see this as the only risk for ignoring her !