After alot of thinking, I have decided to go with the underground fence. My fathers friend told me that they have the fence for their GSD and it works wonders.

We already have a rail fence across the front, and down one side (the side that the train tracks are on) and down the back of our property so he said to run the underground fence right tight beside the rail fence then she won't take the time to climb the fence because she will be getting shocked. That way she is not running right through the fence hardly feeling the shock. The side that has no fence runs up to the creek which she won't cross because its to deep and fast moving.

So with both the rail fence and the underground fence it should be pretty safe and escape free.

I have ruled out the chain link fence because theres a chance that she will one day climb it get her leg stuck and snap it, or get it stuck and be hanging by her leg.

For now untill the ground thaws out she will have to be tied up, and let loose only when Im able to keep an eye on her.