Right.
Warrant to search your house? They can open the door with a battering ram.
Warrant to search your safe? They can open the safe with power tools.
Warrant to search your digital media? They can read the 1s and 0s. They can actually read the files if they can open them. Ball is in their court.
Just for the record, this woman is PROBABLY scum, but violating the 4th or 5th amendments isn't the way to solve this. This isn't 1970s USSR, or modern day Iran. It is the USA and we are supposed to be the fair, civilized, and law abiding country. If that is the only evidence they have, they should have waited for her to incriminate herself some other way before arresting and prosecuting. The prosecutor's office needs to invest in some serious computer power and try to decrypt the drive.