Shuri may have also been killed by Thanos' snap according to the newly released the Decimation. But it appears that like her brother, she's among those who were snuffed out of existence after the Mad Titan's deadly click.
Shuri had a limited-but-essential role in Shuri survived the snap. However, the Avengers: Endgame trailer is implying otherwise.
Related: Avengers: Endgame Trailer Breakdown
The Ronin. However, one shot of a distraught Bruce Banner provides some sense of the wider world: he's looking at screens showing the deceased (or "missing"), one of which includes Shuri. This would suggest she's not been seen since the snap and thus is presumed dead.
It's worth noting, however, that it's a case of heroes being "missing", not confirmed dead. Indeed, the survivors in the Avengers HQ don't know yet what exactly happened to Peter Parker, who died on Titan, nor are they aware that Scott Lang is actually trapped in the Quantum Realm following Ant-Man and the Wasp's mid-credits scene. It's possible that Bruce is looking at a list of the uned for victims and that Shuri has been in hiding. This also checks in with Bassett's earlier statement about Ramonda and her daughter's fate.
Although the remaining Avengers are clearly back in their original HQ in New York, directors Joe and Anthony Russo previously said that bring back Vision.
The question remains about Shuri's possible whereabouts. Marvel Studios was very careful in deciding what to show fans in the Avengers: Endgame's first trailer and based on what we've seen, everything that has been revealed takes place early on in the movie so as to not to give anything away plot-wise that fans don't know already. Similar to what they did in Infinity War, it's safe to assume that the Russos, alongside writers Stephen Markus and Christopher McFeely, have planned more than a couple of plot twists. One of them could be the reveal of where the princess of Wakanda really is.
