Jim,
Thank you for trying!
She has a Yamaha digital piano, put it is too heavy to carry around and does not have arranger functions.
The issue is I can not pinpoint a middle ground. Something like Yamaha PSR-EW310 would do just fine if it had weighted (not synth) keys. And for her uses, I think preowned would be a better choice. She can get a better keyboard for less money. A lot of keyboards are discontinued, so I am not even sure what models to look at.

I asked here, as it seems many people play/played "live" and know about gear far more than I do.