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I think it could also be that it is the butting that decides where the bend happened. I believe the reinforcement ring will actually make the tube stronger locally as there is more material (???). In this case it looks like the reinforcement ring placement is just around where the butting would be happening... Unless it isn't a butted tube...
In any case most road bike / gravel appropriate steel tubes will fail on head on collision. I've been doored at slow pace and still managed to bend the Zona 35mm down tube on my road bike.
@hollow__legs Good call on staying 1 1/8" head tube. No need for anything else imo.
And much love for getting the frame repaired rather than getting a new one. This is the way!
Hulsroy
Great that she is ok and the frame took most of the impact.
Something that came to mind when looking at the photo of the downtube damage: I wonder if the dynamo routing hole played a part in focusing the failure at that location, and whether that relates to where the tube butting thickness changes? It might've interesting to see what the tube looks like cut in half longitudinally.