Welcome to PC.
I don't have kids. But I work with kids. My response to this would be good riddance. I think it is ridiculous that this parent had such a strong reaction that she would try to get your daughter kicked out of the troop, but wonder if she was triggered in some way. I wonder if more than just one or two kids are going to a new troop. If maybe there was more going on before you and your daughter joined the troop (mommy politics) and this mom is using this incident to make her own troop (or to put pressure on an already existing schism in the troop), and knows this isn't a PC thing to do, so the other moms joining her in the new troop are uncomfortable around you because of this.

Don't know if this is the case, but just a guess.