They do sell kits on Amazon Japan. I found this one on Amazon UK as well though seems to be out of stock for the moment. https://www.amazon.co.uk/Kintsugi-Repair-Kit-Ceramics-Beautiful/dp/B08CSWQHBD

Just found this one on Amazon US https://www.amazon.com/dp/B0915X4CDJ/

It might even be something fun to do together as an activity with/for your mom as well.