Delete Service Provider from Drop Down

Hi there,

I have deleted a service provider (and user) but her name is still appearing in the drop down menu where the service provider shortcode is. Can you help be get rid of her completely. I've cleared my browser cache, so I know that is not it.

C. Blackburn is the service provider, as listed here: http://reikiangelintuitivearts.com/make-an-appointment/