Since I am available to only help remotely, something very guided and hand holding would work the best.
Her platform is OS X.
Some options I've found:
Learn Python the Hard Way, http://learnpythonthehardway.org/
A Byte of Python, http://www.swaroopch.com/notes/python/
Learn to Program from Coursera, https://www.coursera.org/course/programming1
CS50 from Harvard, https://cs50.harvard.edu/
Codecademy, https://www.codecademy.com/
CS101 from Udacity, https://www.udacity.com/course/intro-to-computer-science--cs101
Treehouse, https://teamtreehouse.com/
Codecombat, https://codecombat.com/
I'm leaning towards Learn Python the Hard Way at the moment because it starts at a really basic level, explaining how to open the command line, use a text editor, etc.
Any specific recommendations or opinions?