I can't help sorry, but you're so thoughtful to do that for your mother!  

At work, a colleague works with an infinite painter, says he is used to it, not a bad program

Unfortunately i think Adobe has stitched up the market, not in terms of their qualirty products which i don' think others come anywhere near... but in terms of their pricing structure and subscription model... hard to recommend alternatives with the same functionality... i dare say maybe set your sights on the high seas, there are a few good sites which host versions with legit non malware copies... until Adobe provide a more viable p[ricing structure I wouldn't feel bad about pursuing these "alternative" sources...