http://elite-dangerous.wikia.com/wiki/Arissa_Lavigny-Duval
Emperor Arissa Lavigny-Duval
https://community.elitedangerous.com/en/galnet/18-OCT-3301
"Today, dawn broke above an expectant Capitol as Imperial citizens awaited the coronation of the first female Emperor (the Imperial Senate having determined that 'Emperor' should be used for both male and female rulers)."
As for the Lord/Lady topic, Lord is not actually gender specific, while Lady is.
Queen Elizabeth II, has the title Lord of Mann. She is also, Duke of Normandy, and Duke of Lancaster.
As for gender specific prince/princess.
That's a royalty thing, not a navy thing. Naval rank of Prince =/= Actual Royal Prince/Princess. No player commander would ever have a royal title.
Why? Because you the player, as an individual entity within the elite universe,
don't matter. That is something elite prides itself upon.
The combined efforts of all commanders within the pilot's federation however, that is shown to matter.
Within the Empire, to say your ""official"" title should be gender specific when you are issued a non specific one, would be to say that you are as important as royalty, and that, you, a mercenary under the impression that you're actually nobility (who don't get gender specific titles in the Empire anyway),
deserve it.
One of the many Senators would gladly order your execution for some favor with the royalty.
Not only is your naval rank not officially recognized, it can be freely revoked at any time by a senator quite easily. Simply because you're annoying them by asking for a different title.
You're an HONORARY Lord. A RANK within the Imperial Navy. Not an officially held noble title. Were you an official citizen of the Empire however, things could be a bit different, and if you worked hard enough you could become an ACTUAL Lord, and your title would still be Lord. However were you to be an official citizen, you could try to run for a position in the Senate and go from there, trying to get yourself a gender specific title.
So in short, gender specific naval ranks is a no.