Progressives also have to realize that their candidates won't magically win in every district. Still, every primary needs to be contested, if for no other reason than to let the eventual winner know what their constituents value.
I don't think there is really a loser in a primary. The candidate that loses the election learns a bit about the people in their district, and about themselves, which they can take into the next campaign. In fact, I can make an argument that Democrats are in such dire straits right now because they don't have enough candidates losing primaries, and learning from that. That leads directly to weaker candidates in the General Election
I mean, if she manages to win a contested primary, she'll be a better candidate.
If nothing else, maybe she and Gavin will split the Goober vote and let some fresh blood in