To be honest, Hekate isn't really much of a people person. Originally, She is a Titaness, and was not happy with Zeus when humans were created. So to be asked to come to a place where She didn't want to be, She might not show up or show any signs that She's near.
If, in fact, She was interested, try a simple offering or prayer. Normally deities tune into you at the smallest mention of their name(s), and I wouldn't want to waste Hekate's time.