In all instances (well, except the current NCAA out-of-the-box rule) of a line defining a space, be it fair/foul, live/dead, batter's box, catcher's box, pitching lane, running lane, the softball standard is one foot completely beyond that line when in contact with the ground.
While still in contact with the base, this (reasonably) shouldn't apply; like leaving early. But the one foot in contact with the ground beyond once NOT in contact with the base would be the most logical extension.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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