Eddie,
Thank you!
My son plays on Privia, but it doesn't have arranger functions. Just basic 10 sounds or so. Piano sounds great and action is pretty close to real piano.

The one you mentioned PX-S3000 looks great and seems it will play rhythms/styles, but is pricey and used prices are not significantly lower than new ones. Still about 750 shipped. Yamaha is more familiar to her, but I think she is out of luck of finding something portable with weighted keys and arranger functions in Yamaha line with budget she has for it.

After you mentioned, I looked at a few Privia models from a few years back, seems there are some good and affordable options available. I never dealt with Casio arrangers, but I guess some common Yamaha styles can be converted to their format. Only downside is that most of them are 25+ pounds. I was hoping to find something under 20 pounds for her.