The best way that i have ever gotten Ella to come is with a clicker and a treat. Just because she loves weird noises....and she knows once she gets hears the clicker she will get the treat.
But when i'm leaving for work and i'm about to put her in her bed she knows its coming and she'll run straight under my bed, not a treat will entice her. i then have to spend 15 minutes trying to get her out from under there and i am then late for work. it is frustrating but you learn tricks for them to do what you want. Hang in there it will get better!!!!!