Yes, Snyder Robinson Syndrome is passed through the maternal line. All female children of the mother have a fifty percent chance of being carriers of Snyder Robinson Syndrome (meaning that their children have a fifty percent chance of either being carriers (if female) or having SRS (if male). All male children of the mother have a fifty percent chance of having Snyder Robinson Syndrome themselves.
As per medline.com, "This condition is inherited in an X-linked recessive pattern. The gene associated with this condition is located on the X chromosome, which is one of the two sex chromosomes . In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition."