The best-feeling upper-tier Yamaha models sometimes have the identical keyboard action in a lower model. I would call yamaha and ask for the 'families' of keyboards that have the same keyboard design, have her try out each family, and go with the lowest priced item in the family she likes - with MIDI control - the sounds don't matter much, unless you want it to be completely standalone - then you'll have to pay more, since the 2 big things in a keyboard, IMHO, are the keyboard feel and the sounds.