Just like many people, I believe that Taskmaster will die in Thunderbolts* and if it’s true, I have a couple of predictions how it will happen.
She gets assassinated by another Taskmaster. I also came up with a theory that Antonia is not the first Taskmaster and she was actually experimented on to be a recreation of the first one. Before Antonia, there was a mercenary named Tony Masters that was hired by Dreykov to be his right-hand man and an enforcer in the Red Room. He was the perfect soldier and assassin but he then disbanded from the Red Room. Dreykov was upset about this and he thought he would never find someone as good as him or with his gifts so when his daughter got injured, he changed his motivations from saving her life and helping her recover to turning her into a copy of his former right-hand man. I’m guessing in Thunderbolts*, Masters will discover that there’s another Taskmaster and will assassinate her.
She betrays the team and they have to fight her.
But imo, I hope she doesn’t die and instead evolves to be more like her comic counterpart. I also hope that the scenes in the trailers of her other teammates using her gear are just them borrowing it and giving it back. But if she does die, I hope it’s the 1st scenario