Informally, the term "sororal twins" is used:
To Become a Priest: A Love Storybooks. Den Adler · 2007
Patrick shot her a look. “A sore what?” “Sororal twins. It means
sisterly, like fraternal means brotherly. It's in the dictionary. I
looked it up.” “There are no such things as sororal twins,” Patrick
said. Jessica stuck out her tongue.
Your Own Neuron: A Tour of Your Psychic Brainbooks. Abhijit Naskar 2015
Figure 3.1 Monozygotic and Dizygotic Embryo Formation Dizygotic or
non-identical twins (also known as "fraternal twins", "dissimilar
twins", "biovular twins", and, informally in the case of females,
"sororal twins") usually occur when ...
Formally, it is not:
Encyclopedia of Genetics, Genomics, Proteomics, and Informatics PAGE
714 George P. Rédei · 2008 one or both of the twins are girls (in
the latter case, the biologically correct usage should be “sororal
twins” but it is not used).
Fertility and Pregnancy: An Epidemiologic Perspective - Page 306 Allen
J. Wilcox · 2010
Tubal pregnancy (see Ectopic) Twins, Dizygous (Fraternal) Two infants
in the same pregnancy who arise from two separate ova (which raises
the question of “sororal” twins or “trizygous” triplets, neither of
which term is used.)