> She could have decided not to have the child right?
There is nothing in the movie that explicitly supports this.
(Spoilers ahead.) My take is that as she learns the language, her mind is changed. Not only can she remember the future, she comes to understand that she cannot change it. Just like the other heptapod knew it was going to die, but came to Earth anyway because the future is immutable.
Giving her free will introduces a paradox: the future which she remembers will no longer exist if she veers off the path. Unless she can see all possible futures, which is a different story to Arrival altogether (see Dune). The whole visit could be pointless in any case (again, spoilers) if Earth decides not to help the heptapods in the far future. The entire plot hinges on an immutable future.
She comes to understand she cannot change it, yet from her point of view, she decides to call the Chinese. And she chooses, from her point of view, when she tells her husband. She does actions that would have been impossible without knowledge of the future. Maintaining that she didn't have free will when her actions depend on that knowledge is very difficult in my opinion. You have the subjective impression of free will, if you have certain knowledge and you can sometimes act on it, why not always? The book fixes this making it irrelevant to have that knowledge. The movie crosses the line when some causality is reversed.
It's possible that she decided to have the child knowing what would happen to her, and that's why she can see that future, but that's still her making her own selfish decision. If she wouldn't have done that, then she wouldn't "remember" having a child. I think this is why they changed how the child dies from the book. In the book she dies in a perfectly preventable accident. In the movies is kind of pre-arranged. Making her die in an accident that the mother know is going to happen would have been very obviously evil when it's been proven she can sometimes act on knowledge of the future. The book makes the situation maximize the fatalism of the character: she knows her daughter is going to die in that climbing trip, yet she can't do anything to avoid it, she's just an observer, a passenger in her own life.
There is nothing in the movie that explicitly supports this.
(Spoilers ahead.) My take is that as she learns the language, her mind is changed. Not only can she remember the future, she comes to understand that she cannot change it. Just like the other heptapod knew it was going to die, but came to Earth anyway because the future is immutable.
Giving her free will introduces a paradox: the future which she remembers will no longer exist if she veers off the path. Unless she can see all possible futures, which is a different story to Arrival altogether (see Dune). The whole visit could be pointless in any case (again, spoilers) if Earth decides not to help the heptapods in the far future. The entire plot hinges on an immutable future.