[AtlUmpSteve]

You didn't tell us what ruleset; so we'll give you incomplete answers that may not apply.

A couple of things to consider.

First, there is no mound on the softball field. There is a circle, but defensive conferences don't relate to the circle, either.
Second, if a coach must remove a pitcher due to an excess conference, that pitcher may no longer pitch for the rest of that game. Period. She's done pitching.
Third, there is no minimum requiring any LEGAL pitcher to maintain that position, except for the NFHS requirement in the bottom of the first if she utilized a courtesy runner in the top of the first. But you didn't tell us which rules, right?
Fourth, there is no rule requiring a forced sub if someone takes warm-up pitches, or even if listed on the lineup as pitcher (except as noted above).