I actually had a chance to talk to someone who is part of the flight crew who flies her (And other dignitaries) for the US as first lady and they said Jill Biden is the real deal. Extremely nice, even singing happy birthday to one of the crew when she found out it is their birthday.
Kind of one of those things I’m glad to hear about.
Though I kind of thought there was something off, but this was back when Biden was VP. (She would almost never fly on Air Force 2 now since that’s the VP’s designation)