It shows £329 for me.
https://www.ebay.co.uk/itm/Mofi-Phone-Case-Xiaomi-9SE/124393118280 Decent case
What model of Samsung and iPhone similar to this phone specific please?
Unfortunately, Amazon's "good condition" can vary from not bad to total wreck. Either way, I'm not sure these are worth £170.
They have been out a while if she needs a compact but a phone with a good camera and processor then yes this is the best choice, if she's OK with a more budget friendly, then something like the Redmi 7a should do