Actually I had that very same thought myself. Because:
1. She's never really been depicted as acting this way before now.
2. We see repeatedly that Laurel's death really bothers her.
So we'll see if that ends up actually being the explanation for but.
But even if it is just as simple as "lets have some fun by making her the female time-traveling Captain Kirk or James Bond," then I'd still be fine with it. If they can do, then so can she I say.