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Mobile suit explosions are delayed for dramatic effect, so it doesn't mean much. Gaia's suit took about 2 to 3 seconds for his chest to start deforming and blow. Deux's delay was longer, but that was for more drama. She does have some things going for her. First, her cockpit area did not deform, indicating that she hadn't been incinerated by the Minovsky reactor going haywire, yet. Second, and most importantly, the other explosive deaths left no doubt the cockpit was destroyed, whereas we never see Deux's cockpit blow. Third, she's a kid, and while Gundam isn't afraid to kill off enemy kids, it isn't so edgy as to treat them as expendable villains. It's not treated as a casual thing. The most expendable kid enemies are Ple, but we learn a lot about her through Ple 2. They didn't bother with the other Ples as they all had the same personality, and only became different characters once they were split up.
However, while there is some ambiguity, I lean towards her being dead as Anno doesn't like Zeta or Eva characters, and Deux is the most Zeta and Eva character in GQX. Additionally, Anno's self insert, Challia, needs some kills under his belt to justify is badass credentials. In the end, ambiguous deaths mean you can headcanon anything. Pilots come back from more certain deaths all the time in Gundam.