While you can have both in your camp, they used to occupy the same tent spot. Larian has fixed most of these issues, but they still don't have much to say to one another.
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Even with later patches (Patch 6 & 7), Larian Studios introduced a Sheepthara method (polymorphing her to bypass death triggers), but it was buggy. The "zmsfm free" method likely refers to a that treats Minthara like a normal companion—recruitable in Act 2 at Moonrise Towers after knocking her out in Act 1. While you can have both in your camp,