What about using her existing frame and adding a hub gear, like a alfine.
120mm spacing and no braze ons of any kind; no bottle cage mounts too!
Mrs d4's early 1980's claud butler Mixtec has 120 spacing. Fitted a Sturmey SRF-5W with a washer each side. It feels pretty light, and is light enough for her to carry up steps. The alfine hubs are great, but heavy... about 3lb.
@amey started
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What about using her existing frame and adding a hub gear, like a alfine.