The amount of politics in these sort of situations is intense. I don't think it is reasonable for executives - male or female - to sue their employers over promotion decisions. I'm going to point at "Another male colleague’s background was in physics, not engineering, and he did not satisfy the requirement that candidates have an MS in Computer Engineering" - in and of itself that suggests the male was better at the job than she was. We know from Berkson's Paradox in statistics that people without formal qualifications who get a job anyway tend to be good at what they are doing. Amongst people actively working in a field, qualifications are a negative signal of quality.
Female executives using an Equal Pay Act to fight executive skirmishes undermines the look of this sort of legislation. Maybe some people want to pretend that Google executives are delicate daisies that need special legal protections but it just isn't true. This executive shouldn't be getting special treatment because of her gender.