Roxy is just over 5 months and also a picky eater. Sometimes she loves her food and sometimes she sniffs it and looks at me as if to say "Can't I have some of your dinner instead?"
She will always go back to it when she's hungry enough though. It's nice to change it up a bit for her too, she goes mad for milk but can only handle a small bit so if she's being really fussy I coat all her kibble in milk and she cleans the bowl.