Home wireless advice

So working in the networking industry every remote relative comes to me for an and all IT support.

Recently my sister in law came to me for help. Her 16 year old seriously abuses her internet access. We talked and she decided to try out circle from Disney which seems to work. But her daughter unplugs it when her mom isn’t home, gets into her moms phone and edited her filters, etc.

I suggested the option of rotating the SSID PSK but that breaks everything else in the house. Playstation, Fire Sticks, etc.

Question part. I’ve been looking at some cheaper AP options for her but I haven’t looked at home networking gear for years since I worked for an ISP.

Can anyone provide me with some suggestions that would make it easy to create a new network and regularly rotate her PSK?

Thanks!