Mehri

sēn - they (fem.) (ML 351)

PS
*šina - they (fem.) (HALOT 252, Kogan 2009:68, Huehnergard 2019:51–52)

For the distribution of the initial š- and h- in individual languages see *šū̆/šū̆ˀ/šū̆wa (compare also the initial ˀ- in BArm). See Kogan 2009:66, 68.