If she's been having noticeable contractions for that long, something probabaly needs to be done to help her. Can you get a vet? Have you been able to watch any videos or see other goats go through labor, so you know for sure that what you're seeing is contractions? If you are sure she's contracting and unable to get a vet, can you very carefully try to reach in a little further and see if you can feel a kid? It may not be positioned correctly, and that could be why labor is not progressing. You will want to trim your nails very short, and thoroughly scrub and disinfect your hand and arm up to your shoulder. I like to wash the doe's vulva, too,, so I'm not pushing dirt in along with my hand. You will probably need lube. Vaseline or cooking oil should work, if you don't have anything else. You may have to help manually dilate her to be able to get your hand through. You can do that by lubing up your hand and rubbing two fingers around the hard ring of her cervix. You should feel it relax and start to get more open feeling. When you find a kid, try to visualize what you're feeling. Ideally, you will be able to sort out a head and two front legs that belong to the same kid. Or two back legs. Just be sure all the parts belong to the same kid.
Make sure you move slowly and very gently and carefully. If you have to pull a kid, don't tug or make any sudden movements. Try to work with her contractions. I hope everything is OK! Take a deep breath!