Invisible Victory takes place after the events of a story arc adapted in an audio drama, so while it's after The Second Raid you still miss story details. I guess because of that, the show was dead on arrival. The audio drama that Anime Limited & Funimation have does not cover that specific story arc but rather bonus stuff that came from the Japanese Blu-ray volumes.So hold on, going back a bit. Was FMP restarted with S4, ending on a cliffhanger and is basically dead now? Well that sucks but I guess I can stick with the releases in my backlog then.
Originally her weapon of choice was a massive axe. If you look at the original CM it's still there
(and it looks a little absurd actually, if you think about it outside of the almost fairy tale-esque atmosphere that the CM still has.)
Anime TV changed that to what it is. It suits the setting and mood that it has there a deal more. (Though Badass Beautiful Girl with Massive Axe would probably have some rarity value.)
I wouldn't hold your breath, they haven't bothered with a complete set for Kill la Kill, SAO 2 or Erased so why start now...Australia are releasing a complete set of Charlotte will anime limited do a full set release now?