For not having facilities to work with, it sounds like you did all you could.
Tying her off to a tree or fencepost is what I would have done. I had one last year though - backwards calf; I watched it die. Heifer was in an open flat paddock and I managed to sneak up on her and get the ropes on the calf all right, but her temperament wasn't the best. Long story short, she finally collapsed with calving paralysis (after 20 - 30 minutes) and I pulled the now dead, very large bull calf out. If she hadn't started limping and then gone down I'd probably have had to take the whole group into the yards to get her to stand still.
Trying to pull a calving cow in the direction of a fencepost or vehicle is great fun - sometimes it works. I think Lon might be a bit bigger and heavier in relation to the cow than some of us.
Was that a deformed calf? Just curious about the 'maybe some intestine', I've seen a couple of calves born wiht their intestines hanging out; they don't live.