I lost my 9 week old Chicken this morning?

[chick a dee]

I went out to the pen this morning and my Favorolle that is about 9-10 weeks old was dead in the pen. I'm a newbie to raising chickens, so I'm not sure why it died? Is it common? All the rest of them are fine. They have plenty fresh water changed daily. It wasn't a predator. (?) The only thing I've seen in the pen was a gopher tried to come up one day, but this morning thier were no signs of a gopher. (Do they kill chickens?)
No peck marks, or missing feathers.
The weather in CA is not tooo bad. It's been up to 100, a few days ago. I put ice in the water on hot days and fed them watermelon. (That was a few days ago, now were back i the 80's and 55-57 at night) She never showed signs of being sick.
I did toss grass clippings in the pen the day before, but it was just fresh grass clippings?
Well, if you have any idea's I'd love to know.
Thank you.

 

[rebeccakeesee]

Pesticides on the grass could do it. I lost a prairie dog that way.Or maybe a spider bite. But most likely it was a health issue you just didnt know about. This happens to all of us chicken keepers. Even tho it completely sux its just part of the deal. I lost a special ordered bantam roo from my coop recently. Gone. Poof.... Ive had much smaller chicks than him in my coop but this fella was adventurous. The only one to hop outta the brooder which has a lid and be strutting about my kitchen in the am.. My favorite of course and the one I had planned to keep for myself. Dang Leroy! but thats just the way it is.