“[Plaintiff] stated that she suffered from decreased concentration. The Court finds this testimony adequate to demonstrate a genuine issue of material fact regarding whether [Plaintiff] is disabled. ‘Concentrating’ is included in the ADA’s definition of major life activities.” Mercer v. Arbor E&T, LLC, CIV. A. 11-cv-3600, 2013 WL 164107, at *13 (S.D. Tex. Jan. 15, 2013).