Crying Leaf help

[Kennypngn]

So first time trying to run Rise of the Runelords (I know old game) and have have a player that is really in depth with character creation. Created a character that came from Crying Leaf and had ties to the Shin'Rakorath. She did a ton of studying and found out everything she could about it from whatever sources she could dig up.
I dunno something about a sect of elves trying to keep drow a secret from the rest of the world really spoke to her.
But everything she read said that the elves there were very very secretive, to the point that they turned people away from the land and killed trespassers/wiped memories in the guise of keeping there old capitol pure. So here's the issue:

Spoiler:

One of the people you save in the third book is a human who went to Crying Leaf and lived there. Not only wasn't he killed but he helped save the town twice from a dragon/etercap invasion.

This isn't anywhere in any of the background info for crying leaf, and slightly breaks her backstory for her character, and leaves me with a few questions:

1. How long ago did this happen? (I'm thinking he 10-13 years, but wanted to make sure)

2. Does this mean there is a part of crying leaf that is open to outsiders?

Spoiler:

3. Does he know about Drow or did they wipe his memory? Or was he in a part of town away from the invasions (see previous question)

And a few other ones, but need answers to those first