Pink, frothy blood usually indicates lung. If you hit her high it won't leave a big blood trail. With a high lung IM Experience, it isn't uncommon for them to go over a 100, especially if she was pushed. Hopefully you marked the blood trail and the point your buddy roughly saw her go down the fence line. Go back in the morning, if it is open look for the birds roosted in trees (Ravens or Magpies) they won't get on her till light, but will roost near the kill awaiting the light. Sometimes animals can lead you right to your animal.

Good luck, and hope you find her.

Let us know!!!!