I became aware of the character Angela because she appears in the game Avengers Alliance 2.
Out of curiosity, I did some research into her background, and found it to be somewhat novel. She was originally a character in the Spawn comics published by Image Comics, co-created by Todd McFarlane and Neil Gaiman. She was an angel sent by heaven to fight Spawn, or something along those lines.
Then, when Gaiman joined Marvel Comics, he brought Angela with him. She has now appeared in Marvel comics, starting with the 2013 story Age of Ultron. Apparently, she is now the long lost sister of Thor, raised by angels in a secret tenth realm called "Heven".
However, it looks like that Age of Ultron storyline was set in two alternate universes: Earth-61112 and Earth-26111.
My question is, does Angela exist in any of the main Marvel universes, and are the events of the Spawn comics in any way part of the canon of the universes that she is in?