I don't think she's trying to become the next Hydaelyn (that would take a monumental amount of aether to pull off anyway). I think she has, in a roundabout way, made the WoL a winterer without directly asking them to be one. The winterers' overall goal is to preserve life on the star by any means possible.

Halmarut didn't have to come out and say anything to us, but she did. She said "Hey, here's what's happening, and here's what we're doing about it. If you don't like it, find a better way" She actually invites us to figure out a solution that will preserve the most life, because that's her endgoal. She strikes me as being very pragmatic. Where the unsundered were causing rejoinings to make things as they were, she wants to cause them to save lives, even as it costs them. So she comes to us with the problem, because she knows we've got a track record for beating impossible odds, and she thinks we might be able to do something about it.