My first question, is has she been wormed?
Also, ss Hippykitty says maybe she is dehydrated and it's making her go for anything. Even cats that drink a lot on a dry diet, still take in only 50/60% fluid than one on a 100% wet diet. I don't know if you are against feeding wet, but just wondered if it's worth giving her the same amount of dry and a small amount of wet. This will help fill her up, is healthier than her eating any human food she can get and if it's a fluid thing her intake will be slightly increased. If an increase in cat food and liquid doesn't help, then I'd go down the route of getting her checked out by the vet.