Not necessarily. I would grab a cfl and get it as close as you can to plant without burning it. Keep it propped up with stick or something, and when it's stem gets a little stronger you can bury it without fear of hurting it. Just bury it up to the cotyledons. But I would take a chance on burying the stem a bit before I just scrap it and start over. Marijuana is a very resilient plant
Growing outside with stretch like that I would have to say the plant is being shaded my another plant of some kind, I would re-pot her and bury her up to the top set of leaves(top set of leaves one inch above new soil line) and put her in direct sunlight. Any stem you bury will turn to roots, even this young.