Even if there had been life insurance money, Anna's father would have been the one who likely would have benefited. It also seems doubtful that two women in such poor physical condition could have taken out substantial sums.
Anna is living off the buckets of money she makes as a cringy influencer. Humiliating yourself online for clicks is a choice that most people wouldn't make, but Anna made it, and it's been profitable for her. The Fidelity Investments tab seen on her browser (a page or two back) also lends weight (heh) to the theory that she's done some smart investing-- and, yes, it's possible that her father could have offered investment advice or could have referred her to someone who guided her investments. That's not weird or illegal, and it's still the money that she earned herself that's yielding dividends.
With some deathfats, you do have to wonder where on earth the money is coming from. With Anna, there's no mystery.
eta: it's possible that the sister suffered blood clots after WLS. That happened to a friend of mine, a wonderful person who passed away far too young. However, there wouldn't be any compensation for that. It's a possible complication of any surgery, and you're warned. Again, Anna didn't come into mystery millions. She's a fat fool who makes bank by a fat fool online. It's paid well, and it's going to contribute to her demise.