Likewise moved my Mum to Ubuntu about 10 years ago and it dramatically improved our relationship. Hasn't all been easy e.g. photo management has been a moving target but largely it's "just worked" during that time.
Same here for photo management - there is still no perfect solution so far. What did you end up using ? I am using a combination of Rapid Photo Downloader + Shotwell - not great, but it kind of works.