Unless there are some circumstances that switching will protect her then no. My opinion of course. I learned a long time ago that nontechnical people, young or old, need to value and want to use the tools or it will only cause frustration and less trust in your opinion on other things that may be more critical.
You can explain why something is better or worse but let them make their own choice without being pushed or they won't be invested in the change.
P6P is a solid phone and I've had great luck with it. I haven't maxed anything out so wondering why I should get a faster chip with more memory so I can take photos of my dog and message my friends. Google Fi is doing just $400 off a 8P which I may take because I don't want their watch or buds. I'm not sure what I'll do.