What's to understand? She used to wear a costume until Purple Man fucked her life up a bit. She's a Marvel comic character. Continuity means absolute dick.
If Bobby Drake can suddenly become gay, and Bobbi Morse can suddenly go from a rape victim to a cheating spouse, then Jessica Jones can become Jewel again. As a matter of fact, you could retcon away her marriage to Luke Cage by making a deal with the devil, and Marvel would be A-OK with it.