If she's all set on the Niro your life will be easier if you don't try to talk her out of it.
This article says the Niro plug-in will be available in Europe this fall but no word on USA.
See if she wants to wait for the plug-in, and if so you could look into extending her CR-V lease until then. I know Honda does extend leases to some extent.
Otherwise if she's cool with the non plug-in and thinks fwd is fine then go for the regular Niro.