Not to ask the obvious but she took 20 years off to raise her kids and now wants to be home for her kids? How much longer will her kids be at home? That being said, coding is coding. Just needs to do a sample project.
Teenagers need parental attention just as much as younger children—more, in some ways, because while they don't need constant attention like young children do, when they do need help, it tends to be more serious.