Ignore her for a while, like set your skype status to busy and don't reply or don't sign up to skype in the first place.
If she asks (for example through other means) why you don't talk to her as much anymore tell her "Well, I don't have as much time for that anymore, I'm looking for a girlfriend and since you keep telling me you're out, I gotta spend my time elsewhere..."
Or something like that.