The FBI already had her computer. It was taken months ago and was used in analyzing the emails that pulled Petraeus into the case.
The fact that the FBI is now going deeper appears to imply that this case is about something quite a bit larger than sex and romance.
They raided her house because they are embarrassed and they will overuse their immense power to get someone. If you have experience with prosecutions you know these guys often are over zealous and it can turn off a jury.
I’ve seen corruption cases where the prosecution is trying like crazy to introduce evidence of the defendant’s mistress, including sex toys, etc. The judges often have to rein them in.
Especially, I think, when she started singing about the CIA taken prisoners!!!