10 years of support. Not bad.
Just install Linux on it (if this is what she wants, regardless of if you think it’s better) or find a M1 MacBook Air for 7-800 if she wants a Mac.
I have a 2012 laptop, and upgraded to the M1 Air. Using the old machine is painful now, I didn’t realise how slow it was.
10-11yrs from a laptop is pretty great. I wouldn’t call it planned obsolescence.