A lot of people like the Casio Privia if you can believe that Casio became a major player in the music game. One of my friends who is a gig [*****] uses it because it is light, and he is in a band that does jazz standards, a rock band, and plays behind 2 country acts here. All on that keyboard. OR, just thinking, a MIDI controller and a laptop and she could play all virtual instruments.

Look at Casio Privia PX-S3000. I don't know budgets here but that will run $850 new. You can find them used for $500-ish. My own preference is that I don't like anything with speakers in it, but then she doesn't have to move an amp if she has one of those.

Or you could go with her and be her crew!!