I think it is important to remember that HH was 17 or 18 in 2020 - a kid (18yr old legal adult is a kid to me in this context) doing what her mother told her to do. Even if LS was explicit about why she needed HH to buy supplies, what was in the suitcase, and why the drive to Florida, it would be unreasonable to expect HH to say “Stop the car, Mom. This isn’t right. I’m calling 911. I’m going to have you arrested, Mom.” HH had/has LS, and that’s it. And, of course, HH doesn’t want to end up like Gannon.
JMO.
That said, I’m sure HH was threatened with accessory charges.