It's been a pet theory of mine that the Street Fighter Developers have long been hardcore fans of Sailor Moon...just check out the credits section from the SNES SF2 and up, games released during the 90's, there's always a mention of Sailor Moon, Super Sailor or Eternal Sailor. Sailor Moon has also influenced the creation of certain characters like Chun-Li and Sakura as well as Cammy's back win pose since SSF2.
My theory is that Ingrid is the culmination of Capcom's long time Sailor Moon obsession. She had cups on her head like SM, her original costume has aspects that resemble a Sailor Fuku and her powers are centered on the Sun, the last heavenly body that remains unrepresented in Sailor Moon (I think.). Ingrid is technically Sailor Sun, Capcom's own fan character for or a homage to Sailor Moon but of course, they'll never admit that.