The phrase “she stands in their middle” locates the woman leading in the same row rather than in front of it. The arrangement indicates who leads while avoiding the disfavored forward position under this ruling.
Opening interactive controls...
Why Does a Woman Imam Stand in the Row?
Congregational Rows, Women Leading Women, and Adjacent Alignment
The phrase “she stands in their middle” locates the woman leading in the same row rather than in front of it. The arrangement indicates who leads while avoiding the disfavored forward position under this ruling.