I main support and am currently smurfing, so I can't explain to you how hard it is to 'learn' support at a low level in this game. People just do not know how to utilize supports prelevel 20 or so and it usually leaves the support useless and vulnerable. That said, it is possible to learn to play even if is difficult. My first advice would be to not teach her to fight minions. As support, you should rarely ever fight minions unless the ADC is not present and even then, you shouldn't push the lane much. On average, a support should have 20-30 farm by 20 minutes where as an ADC should have around 100-150 if you're 'average' and closer to 200 if you are 'good'. So teaching her to fight minions is counter productive. :P As support, the whole idea is to really keep your ADC alive and it's all about timing and setting up opportunities for your ADC to succeed. It is something that will come with time and she will not learn over night. I've played around 2000 games as support and I still have timing issues from time to time, so yeah. It's rough.
To be honest though, my best advice would be to get her a Sona. Sona is the support I learned to play on. She is a nice, passive support who is easy to learn and has no skill shots except her ult, which has a broad and easy to aim range. Put her on Sona, let her play some games, and tell her that her only job is to use her W when her ADC is hit, use E when she wants to run away, and use Q to poke at her enemies when they get close to her ADC. Do that, and she'll pick up on support play quick. That said, if you would like someone to play with her and show her the basics of support, I would be glad to play with her on my Smurf. She will need voice chat such as Skype though because it is extremely difficult to explain how to play via in game chat. Just let me know something.