Car appreciation... the aesthetics, the engineering, etc

An elderly relative has a 2016 Audi Q2 which they bought new (40k miles now). It's diesel, and scandalously, not ULEZ. It's also had a spate of unreliability. They come in to the expanded ulez maybe 1-3 times a week.

She thinks she would do well to part-ex the Audi (£9k) for a slightly used petrol hybrid Honda Jazz (yeah I know, £22k). She would own this outright.

I have three questions for you lot who know about this stuff

• is a Honda Jazz the right car? It's a small hatch, but they own, and enjoy driving (on the M25) a small 4wd SUV. You aren't getting younger and the Jazz presumably isn't going to get easier to get in to
  
• Is petrol hybrid of enough value to not just Petrol? They have no charger or solar at home, but could get one, alongside a charger sympathetic leccy tariff
  
• should they own it outright? There are other ways (lease / PCP / HP etc) which might suit their situation better
  
  

What do you lot think?