lol, idk what to say here. the Betta that looks like Delta in your sig resembles the exact body and fin of my supposedly Delta yet it almost expands over 170 degrees when flares and has that excessive branching, giving him Rose tail looks, he definitely isn't a delta, im pretty sure. either a super delta or he is a Rosetail, with Almost! 180 achieving flare while still retaining the wavy round ends of a Rosetail.
and as for your spade female, im pretty sure she IS A Spade Female. Spade are not common anymore but was available in abundance back in 90's or so i read on a website "www.bettysplendens.com", so basically they are the result of their currently ancient Spade ancestors leftover recessive genes that popped in from spawning certain betta strains that carries them. i recall reading an article somewhere about a spade female betta that came from a both Halfmoon couple betta spawning?
aside that fact, im convinced ANYTHING is possible when it comes to selective breeding a betta and achieving the ideal Betta spawns that can make you say "OMG! NOWAY AM I DREAMING OR...OMG!" kind of results. i am looking for a pure bred Plakat female with silver or Opaque/white color for my Rosetail Male. why Plakat? they are slightly bigger in size and they also have much thicker fins compared to other long fin cousins, im pretty sure the spawns won't achieve the longer fins that of my male but some might inherit the shape that my Male has and that's my goal for now. i don't see anyone selling Rosetail pairs who sometime pops up from halfmoon spawns according to the Rosetails history. Besides my Male is very Feisty and aggressive with other males but very gentle with the female bettas that i introduced to him, lol. it's a worthy trait to be passed on.
im totally off topic with my reply aren't i but that forgive me for my long story about my Rosetail which i bought classified as a Delta. i just bought a Spade tail female today and she resembles your female EXACTLY along with my male rosetail with same color except yours have blue coloration around caudal/anal fins, mine has only on it's edge of the dorsal, first name for him that popped in my head was "Skyline" lol, ill post a pic of him later but i did manage to take my spade tail females pic which i took half an hour to get a good snapshot with my crappy cam.
take care of your spade female and if possible breed her, you never know what pops in and that might surprize the **** out of you or everyone lol.