I feel she will not be convinced that Rajveer is the main culprit. And of course, he will not die. How can he? The makers will definitely bring him back in a different avatar. Oh well.
If the above turns out to be true, it will be very unfortunate and a real horrible way to move things forward.
In any case, I feel the makers have to finally end up showing that Sid will live with DD and family under the same roof. Given this scenario, the above is very much possible.