Here's how I did my net. The net cost me $60.00 it was 100x100ft. I cut it into 4's so I have3 replacements. I put the post in the middle to make a tent like pole and just used a heavy duty stapler and stabled it around the run. My run is 25x25 ft. Just google anti-bird netting. If you need more detailed pic's just ask.
I'm terribly sorry for your loss of Betty. She was such a beautiful hen. May she rest peacefully. On the predator advice, you could use hardware cloth to cover the run...
A friend in San Diego, right downtown almost, has the city permitted 8 hens and Hawks were raiding! Right in the city. He used mono-filament fishing line the way @BYCforlife did. It was almost invisible, but stopped the hawks! And the seagulls, which dived into the yard looking for food.
I have to put the bird netting up and take it up every season for the snow. but it keeps my run safe during the day. Not predator proof, but keeps the hawks out.
I gave up the electronetting b/c of hawks. Depending on how often it's moved, bird netting could be used, or even fishing line. If using bird netting, I'd set up the electronet so it would fit the 14' width of the bird netting.