I looked up maybe in the dictionary and it meant possibly, so technically you did agree to help. You also said you would contribute if you had time to invest and that's why I said you would contribute sporadically. The BB-Mail you pasted is proof of my side of the story.It's like they say, 'There is always two sides to a story.'
Sorry but you clearly missed her point here. She said 'maybe' when you asked her to write reports and then you went out and wrote that you had 'convinced' her to write reports for you. That's where the disconnect takes place my friend because those 2 things are clearly not one and the same.
Since you were asking her for a favour, instead of digging yourself deeper as you did with your reply, I would have instead simply apologize to her for your mistake.