I think two things may imply Serwa might've survived;
She seems to think "father" after debris falls on her, and Kayutas carrying "her body". I think it's through Mimara's perspective that we see her body being carried, but Mimara might be mistaken in assuming that she is dead instead of passed out, and well, from a meta standpoint, what could be the reason for mentioning Serwa's body at all? Of course, it could just be an off-handed way to remind us that Kayutas lost his sister, whom he loved, and that Kayutas is still alive, but it might also be implying that it is not the end of Serwa. Like many things, we'll see the definitive answer in the next book.
Edit: Reading back, the section refers to her body being "blasted". Yeah, that convinces me that she is gone for good.