Help finding "learn to draw" app/software for my mom?

Hi, r/learnart. My mom has just been diagnosed with terminal brain cancer, and she will soon be starting chemo/radiation. She's had to quit her job, and will be spending a lot of time in bed. My mom loves to draw, but she is losing some cognitive abilities, and can't keep track of all of her art supplies - so she will be incapable of traditional pen and paper drawing.

She wants some sort of a tablet that has "learn to draw" software that she can follow along with when she is able, and that will keep her mind occupied. I'm thinking a DuoLingo of sorts, but for art. I can buy her a tablet and stylus, but I'm having trouble finding an app or software that will give her interactive lessons. She specifically wants the lessons to be interactive on her tablet - not just a normal set of lessons delivered as a webinar. Does this exist? Does anyone have any recommendations? I'm feeling really overwhelmed trying to choose the right thing for her, since I really don't know anything about the subject. Thank you so much for your help.