While it is possible, it is highly unlikely as she is still in Hueco Mundo. It also depends on a lot of things: First, how is she supposed to know that she is even needed there. Second, how would she know to go to the real Karakura Town when the fighting has been going on in the fake Karakura Town? Third, she would have to find Matsumoto, which is rather hard given that Aizen stated that her reiatsu has vanished. Then there would need to be an actual body for her to heal. Shinigami disintegrate into spirit particles when they die (though it is not known how long this takes).