I think Lindsay has a certain amount of street smarts and probably toughened up a bit in jail, but Sarah is certainly in better shape and has legitimate training in martial arts. Lindsay does have some size advantage, of course. I think the bottom line is that IF Lindsay is sober and together she'd have a reasonable chance of winning, particularly if it was a street fight scenario. However, if she's out-of-shape and strung out, Sarah would almost certainly take her apart. In short, the circumstances of the battle would pretty much determine the outcome.
-JM