And that italicized part is IMO a flaw in Hel's plan, though perhaps an indirect one. For the gods who have created millions of worlds, and have had to thanks to the snarl, all gods benefit from a situation where the Snarl can finally be contained. That benefits Hel as well as all of the other gods. Her plan's flaw, in this perspective, is rooted in hr inability to (1) look to the long term, and (2) to look past her own desires.
If the current world continues isn't she stuck with the current arrangement? It would seem to behove her to make sure that this world ends, especially if a means may have been found to continue it indefinitely