If you are still stuck, please scroll down to learn more about each hint.
Hint #1
Revisit AstroIV.com. There's an area of the site you probably haven't explored because you need special access to get into it. In your evidence you have half of the information you need. Utilize IT to get access to this part of the site. You'll need to find and answer three questions in order to get in.
Need another hint? Scroll down...
Hint #2
Revisit the piece of evidence that has a conversation between the only two people who both knew Sandra when she was young. The street Sandra grew up on is not mentioned directly, but is referenced in the conversation. You'll need one of the personal records in the case file to fully uncover this answer.
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Hint #3
There's an article in evidence that has Sandra's favorite book referenced in it. You'll know you've found the right title because the author of the book is someone in this case.
Still Lost?
Here's a final hint to get you to the next objective...
CLICK HERE FOR ONE LAST HINT
If you're still stumped, go to the login page on AstroIV.com. Type in Sandra's login found on one of the evidence pieces in Bonus Envelope B. Click "forgot password" and fill in the answers to the prompts you've uncovered.