Tonight she is writing her own adventure, "The Cult of Nyarlahotep," which is a fairly straightforward dungeon crawl. The first level of the dungeon will have about 10 to 15 rooms, and about 8 encounters. Three pieces of a key will be hidden that will open up the passage to the second level, which she will design later, but she intends for it to be bigger.
I let her walk me through character creation, as a I roleplayed players who don't know anything about D&D. The stickiest point for her was on thief abilities. She thought that it was unfair how ridiculously unlikely thieves are to succeed at their chosen abilities. I have to say that I agree, but maybe there's something I don't understand.
She was also quick to come up with another house rule, allowing the player to reroll one attribute of their choosing - but not necessarily the lowest one. For example, if the player knows they want to play a fighter, maybe they want to reroll that 8 dexterity, or maybe instead they want to reroll that 11 strength.
It did tickle me that she's memorized the attributes in the old school order and when I tried to write them down in another order she corrected me and told me no, because everyone has to roll them in the same order.