I personally dont think she will die, kishi throughout the chapters stated that she couldn't die in battle due to her medical prowess. He would then be contradicting himself right?? So it would be weird if she died now > . < and katsuya said that she could stick her body back together, which gives some type of indication that she might be able to survive the ordeal. Along with the fact that we havnt seen the Shikkotsu Forest, which might be linked to slugs or maybe a sage mode for slugs. Then tsunade said to katsuya to take the kage to where she was. So im guessing to bring them closer to her bisected body or there going to the slugs place. And cant katsuya multi task like split herself and tend to all the kages while she sticks tsunade back together. She still has her chakra reserves btw thanks to dan as you can see still see the marking on her forhead. ummmmm what else lol and she told katsuya to worry about her body later, sounds to me like she can fix herself up later but wishes to tend to the kages before they die. IDK lol to me it just doesnt seem like the right time for her to die.