There is so much time, effort, and physical waste that is generated by slightly redesigning phones every year purely for the sake of making sales (as opposed to meaningful improvement upon the existing design or introduction of a new hardware feature). Think not only of people upgrading for the sake of it, but all of the cases, screen protectors, and other assorted accessories cast in plastic for previous models that are garbage now.
It would be nice if we could just space these things out to 5 years or so now, because that's probably how long it takes for anything to change enough to justify a new model.
Of course when it was new the camera opened quickly. And then Apple made their OS more heavy weight every year until my phone slowed to a crawl.
And faster phones are nice, but I think it is worth considering how valuable that really is to us as users and a society, especially if the process involves making loads and loads of ewaste and consuming tons of new resources, and all the emissions their mining and transport involves, when we could simply keep our software slim and our old devices functional.
And the big companies will never do this. Do we need to force them to allow open software to run on these devices, so that clean builds can be patched and maintained when the company over bloats them or abandons them?
This is beyond stupid how fucked up the phone market is. I'm still using my 2008 laptop with newest LTS (x)Ubuntu, but my 2018 Android phone lost official support in 2020... Thanks to that, now I have iPhone (longer support) and Fairphone 5 (I like how they try to upstream everything for this phone and promise really long support).
About your question: Should be fine. As long as browser is up-to-date, she doesn't connect to unknown WiFi networks/Bluetooth devices and she is not targeted. The easiest security fix is to not have anything worth anything on the phone :D