Well, frankly sentences in the USA are barbaric. We also have the habit of handing down terms that are impossible to satisfy, eg. for probation. They'll take away your drivers license then tell you to appear in several locations around town to avoid jail (btw a driving infraction isn't always necessary, although even if they did commit a DUI, that doesn't change the practical side). You'll get charged money and taken to jail for being too poor. It's not uncommon to resort to crime to raise money to pay the state to avoid jail.
All that said, I would hope for at least 8-12 years, possibly more. I don't take that sentence lightly and consider it very harsh (I can't stand people from the USA that consider less than 5 years and "easy sentence"). 3 years is a serious sentence, and 8-12 is extremely harsh, for good reason. It's very important to me to call this like it is. There should be heavy handed punishment, because this is among our most serious crimes.
She blatantly lied multiple times about a medical product. She had a team of enforcers harass people who tried to talk. Across the board, it was a very extreme case. More importantly, with so much at stake, these type of white collar crimes are quite frankly worth committing if the sentence is less than 5 years (I'm not sure the exact number, but it's at least 5).
For a substantial portion of the population, having that kind of wealth and influence for a short time is worth it; in some cases, even if you die. So it might not deter everyone, but I do think the possibility of spending lots of time locked up, will stop a lot of gray area people.
I also think it is necessary for fairness. I care about making these crimes "not worth it". At a certain point, you're basically letting people keep their ill gotten gains. Getting to be king for a decade, then go away for a year or two is no punishment at all.
I don't think 10-20 years is necessarily inappropriate.