My first reaction to reading that she bought millions of dollars worth of jewelry was, “Idiot!”.
Then I thought, maybe not - if she’d traveled around the world and stuffed safe deposit boxes with cash and swag, it might have been a good plan. That’s how Whitey Bulger eluded authorities for so long.
Reading further, it seems she actually flaunted the expensive jewelry. I repeat, “Idiot!”
So, a smart crook would have laundered the money smartly. Prescious metals, jewelry, offshore accounts, negotiable securities, assuming it could be done without a paper trail. (I’m definitely not an expert at this, but I’ve read a lot of true crime books.)
Use a little of the stolen cash to pay bills. Avoid the trappings of wealth. Bring your lunch most days - if you want to eat champagne and caviar, do it away from work. This creates the appearance of a frugal person, which can explain high savings should the cops look into your declared holdings.
Make regular, on-the-record, reasonably sized donations to non-controversial charities. This would tend to shake suspicions of investigators who are comparing your profile with other suspected crooks.
At some point, assuming you’ve avoided heat, announce well in advance that you are moving to Europe, the US, or some other developed country (maybe mention an impending marriage). Leave a forwarding address (a PO box).
Then head for some tax haven where they don’t ask questions, after putting a new identity in place.
I await corrections from real experts.