Some of them are very picky eaters. I think my girl is the pickiest eater of all time. I had the added problem of cats that were more than happy to eat what she refused. If she would not eat I had to take up the food and try again later or sit and defend it.
I think the fact that these little darlings go every where we go makes it even harder to get them to eat dog food. They smell that great smelling people food and they know that is what they want! Why wouldn't they? So it's best to ignore their woeful stares while we are cooking and eating and then try to feed them when there is no people food around.
As was already mentioned they are very scent oriented so they will smell their food much better if some other scent is not blocking it out. If you have a high quality food that you want you darling dog to eat then stick with it. They do sell toppers to shake onto dog food to try to entice them to eat better. I always go for all natural products that are made by companies that I have investigated as much as possible to know if they really use high quality ingredients as they claim.
Never give any treats before mealtime. I changed Gracies meal time to late morning so that she would be good and hungry when the food is offered. Then we do some more exercise and training with some small treats. I found a really great food that Gracie loves. One out of so many I tried and of course it was the most expensive. I'd rather feed a good quality food than have the vet bills that feeding poor quality can bring. Hope you little girl gets eating better soon. No having other dogs around at meal time could also effect her desire to eat. The competition for food often drives them to eat more.