Not really understanding this.
The 40 year leap ahead is not significant. Someone from 1971 who came to today wouldn't be a caveman.
And unless she is rich now and leaves stuff in her room or hidden somewhere (a room unchanged for 40 years? why not let her find a unicorn while you are at it). I don't see what she owns mattering that much either. Unless all the shops are empty in the future. But that is the signifcant matter. not the time leap.
Just like we'd say to 1971 hiker 'look at these great multi tools we have now'. They'll have better stuff in 2050. Though not necessarily much better. Down, wool, armalites, leather, the list of stuff that hasn't been improved on is endless.
Except for stuff degrading. This would be the same scenario if she was prepared now for apocalypse and her family weren't.
What every survivalist site is about.
qjs