I dont believe she didnt take the plea to protect people, and...
Come on, an intelligent savvy person would never turn down such a crazily favorable plea (turn over hard drive in return for all money back and no prison) because she wants to protect other people or their families. That's such bullshit. She probably wrote it in the book to appear "good", it's a self-image thing, but it's far from the truth.
I think there must be something more as to why she pleaded guilty without taking the plea bargain.
1. the info contained in the hard drive could indicate other crimes she committed, I assume the immunity would not cover these crimes.
2. some big people would be in it, including mafia like Russians, Irish, Italian. if she becomes mafia target by the Russians , she could be tortured and die, a fate worse than the sentencing guidelines by the prosecutors (42 months in prison). 42 months is 3.5 years. In federal prison she might be in for 3 years, and minimum-medium security for white collar crime like that.
Anyways it simply didn't make sense for her not the take the deal. There must be something else.