She would like the same colour, stealth black and I think the Raven comes in gloss black. This could be a big issue. I hadn't considered the step through frame though. Personally I don't like them but then I wouldn't be riding it. I'll discuss that one through.
For me, the RST seems to be the right choice for all the reasons I chose it plus the Raven is slightly heavier and we have been considering much lighter bikes as options including folders. She had a go on the Airnimals and really liked them. Chameleon particularly. However I think having similar bikes would be the best way to go. Only needing to carry one set of tools, tubes etc between us.
Steve