"would she actually get in trouble if she were to shoot a fox that is entering or exiting her chicken coop? I was just wondering if there is something protecting landowner/farmers against destroying their livelyhood?"

--I would guess that you are correct, if they are attacking farm animals you probably wouldn't need to go though all the red tape to start waxing them. It might not hurt to contact the PA Game Commission though, just to make sure. There are six different regional offices, you can find the phone numbers on the website.

http://www.pgc.state.pa.us/pgc/cwp/view.asp?a=463&q=150174