TY-378

Perhaps. "Guardian angel" is a specific term, maybe something like a GA, at least having interdimensional and/or time travel abilities (whether her own, or imposed on her by something "above" her.

There is no evidence for this, but it would explain her death and rebirth as well as the "as new" Viper...and knowledge of Earth's location.

Deus Ex Machina...the ancient Greek plays had this contrivance, and they were still enjoyed without overthinking it. Lessons learned with it.