how do I find a chicken's hiding spot? semi-emergency

any ideas greatly appreciated. My welsummer hen is hiding a nest somewhere. I had not seen her for 2 weeks or so, and then today I saw her for a short time, then she went back into hiding. I know she's got a nest in the blackberries somewhere, but how to find it?! We have 1 1/2 acres, half of which is field, some with a wooded area with blackberries. There is a lot of brush for her to hide in. I tried taking a can of feed and shaking it hoping to hear her cluck or something, but nothing. I want to find her eggs to put them in the incubator because last time I let her hatch eggs a couple months ago, she killed the chicks as they hatched!

 

I actually really like the brush - because it's a privacy screen and sound deadener! We live in a not-so-great area and I'd really prefer not to have to see my neighbor's who live in camp trailers I want more brush to go clear around the property actually, LOL. I suppose bushes would be prettier, but they aren't free like blackberries, hehe.

I might have to pay my son to go beat brush with me to find her - wonder if he'll go for it? LOL. I don't really have time to sit around and wait for her to come out in her sweet time.......

 

I knew she was hiding a nest somewhere! I beat the brush trying to find it, to no avail. Well, yesterday I saw her out again and I waited and waited to follow her to her nest when she went back. Then it started to rain - so I ran inside to get a coat and when I came back she was gone! Well, last night I had a dream that she was in the rafters of the rabbit barn in one of the rabbit nesting boxes that I put up there. So, this morning I went out there and looked. She wasn't there. But, I remember seeing her come FROM the fenced area that the rabbit barn is surrounded by the other day when she came out. So, I looked in the tall grass, in nooks and crannys - and finally I looked in the COMPOST bin. She was in there! Soaking wet and sitting on 13 eggs!!! So, I took her out and put the eggs in the incubator to hatch. Last time I let her try to raise babies she killed them as they hatched, so I wasn't going to let that happen again. So, now I have actually 17 Welsummer eggs in the incubator! I had 4 others already in there that were the last eggs I collected from her (when I thought she was gone, I decided to hatch them instead of eating them). And, now I understand why the roo hasn't left the yard as much as usual!!! But, now I gotta break her broodiness so I get eggs to EAT again. Guess I 'll have to put some wire over the top of the compost bin!!