Grace is like this sometimes, and it's no one's fault but my own. Like the dog Nazi says: "she'll eat when she's hungry." I hate that. I can't watch her not eat.
For years, I've been putting "a splash of milk" on her food to make the dry kibble taste better. I'm lucky that she eats with that on it.
I started the splash of milk when Lady had her first ACL replaced and wouldn't eat. They both got milk on their food or at that time canned food mixed in. Since then, Grace won't eat her food without her splash of milk. I'm not sure how the ex gets Lady to eat her kibble now, but I like to think Lady still gives him that "where's my splash of milk?" look when he puts a bowl of dry dry food in front of her.