The actual drop section aside, will simply putting a set of wider flat bars actually change anything? I suspect she will be in better much the position on the grips of a flat bars as being on the hoods but maybe with her arms spread wider.
IMHO switching to flat bars or a bar with modest rise but leaving a regular road stem on the bike is almost pointless in most cases.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk