I haven't heard of them dying from too many seeds. The main feed I give my yearling to adult peafowl is black oil sunflower seeds - they eat the shell and all.
The hand raised peachicks only eat medicated chick starter until they are around a year old when I introduce them to the sunflower seeds. The peahen raised peachicks have medicated chick starter available but since they are in with the adults, they can eat seeds if they want.
Of course I give a little cat food to my peafowl and sometimes pellet food (rarely since they don't care for it) and vegetables, fruit, leftover food, and they have access to grass.
I give my peas sunflower seeds almost daily and there are always seeds left over from the previous day that they didn't eat.
TearDropSoup - It sounds like you are giving her a good variety. Even if she is eating bugs, it helps to give her just a bit of cat food maybe 2 days a week. A handful might be the right amount. The cat food my peafowl love to eat is 9 lives cat food and they like the tuna & egg flavored one. My peafowl are picky, and they really don't like game bird feed. They pick out just a few seeds from that, and most of it goes to waste. Game bird feed looks great because it has so many seeds mixed in, but the peafowl (at least my peafowl) don't seem to think it is a yummy mix.
Have you wormed your peafowl yet this year? Some people worm more, some people worm less. It depends on your situation. I worm my peafowl at the start of breeding season (spring) and after breeding season (fall).
Here when I get a bird that isn't eating, has droopy wings, etc, I don't wait long before I treat it using safeguard. I have only lost one bird due to illness so far and I think I didn't treat her in time and that is why she died. That is just what I do, and I am not a vet, I am just an art major.