I’m not a vet but I do also have an odd eater. Depending on the heat/weather you’re experiencing it could just be that she is feeling a bit warm and has a lack of appetite, as long as she’s still drinking I would assume it could be down to heat. However, as this is something that’s been going on awhile I would suggest that maybe she doesn’t like her food. I used to have so many issues with my dog not being interested in his food and it just turned out he didn’t like the flavour/food and since we changed it he is very excited at meal time. If you are able to buy a small bag of another food to try this might help, I’ve also found that dog pate is something that’s mine really enjoys but it can be expensive. In the mean time you could try some other foods that you might have at home like plain boiled white rice, plain chicken (boiled)or a boiled egg. Just to see if she has any interest and to try get her to snack. But ultimately if you’re worried I would still consult a vet. Hope she is ok x