This is the Games Workshop Adepta Sorotias Battle Sisters Squad 52-20

Adepta Sororitas - Battle Sisters Squad pack contains enough components to build up to four Battle Sisters with any of the following Stormbolter, Flamer or Meltagun, and two Battle Sisters with heavy weapons, one with a Heavy Bolter, one with a Heavy Flamer

 Can be built as one of three separate units: Battle Sisters, Dominions or Celestians