Line breeding IS inbreeding. Inbreeding is defined as the breeding of closely related individuals, so breeding son to mother is inbreeding. Breeding related individuals from a certain strain or line of animals is line breeding. So technically breeding son to mother is also line breeding, but usually line breeding means inbreeding through several generations to obtain a desired characteristic in your stock.

http://www.answers.com/topic/line-breeding
http://www.yourdictionary.com/line-breeding
http://www.thefreedictionary.com/inbreeding

Its pretty much all the same, but yes, breeding son to mother, sibling to sibling, daughter to father, etc is all considered inbreeding.

Thankfully within most reptile species, inbreeding does not carry a big risk of defects.

Your female is definitely pretty and will make nice mojaves. But as most have already said, she is quite skinny and will need to beef up a little. This could take several months depending on how well she eats. I would try to get a current weight on her and feed her small meals every 5 days. Either way you might end up needing to wait until next season anyway. I would advise just feeding her well until next season starts and just start then. There is no need to rush the female.