“‘Fact-finders must determine whether a function is ‘essential’ on a case-by-case basis.’ [The employee] testified she couldn’t ‘remember having to lift more than 10 pounds’ as part of her duties, and her colleague . . . has provided a detailed affidavit that, if true, establishes that such exertions are virtually never required. While [Defendant]’s witnesses testified to the contrary, this conflict merely establishes an ‘actual controversy’ of fact rendering summary judgment improper.” Equal Emp’t Opportunity Comm’n v. Vicksburg Healthcare, LLC, — F. App’x —, 2016 WL 5939424, at *3 (5th Cir. Oct. 12, 2016) (internal citations omitted).