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Yeah, it depends on the bike - my Langster has similar geo to the Allez and as I recall that was sold as a "medium", I think it's 48cm.
It might be best to get her to plug her measurements into a fit calculator to get a ballpark of sizes that would probably suit her. This is the one I use: http://www.competitivecyclist.com/Store/catalog/fitCalculatorBike.jsp
She has no real preference for a womans model. What size bike do you have? i know it varies from bike to bike