I'd say she is tracing roads with the help of Google maps, as she is working in Photoshop. Though that would be rather pointless in my opinion as most cities have completely changed shape, size and especially road systems since back in the 1930s.
Old city maps would be the best choice, together with autoroute maps. Both can be found on the net. Also recon photos can be used for comparison. At least that is how most serious map builders for IL-2 work.
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