In the Infinite Tsukuyomi, Tenten had stopped fighting the temptations and decided to stay. In her dream world, she was a weapons jutsu master, capable of defeating Hanzo the Salamander from the rival Hidden Rain Village. With the help of the tools of the Sage of the Six Paths' tools of course. She got to know this world's versions of her friends, despite the fact that their personalities seemed to have swapped. For example, the Naruto in this world was called Menma and acted more like Sasuke. And the Rock Lee in this world acted...mature. In fact, so did Guy Sensei. It was weird, but at the same time, Tenten smiled. Because the best reason of it was that in this world, Neji, despite the fact that this world's Neji was a pervert who used his Byakugan to look through women's clothes, was alive. Unlike the Neji in the real world who tragically died because of Madara.
A part of her wanted to leave as she knew the real friends were in danger somehow. But Tenten brushed those thoughts aside. There was something else that nagged her mentally. Menma once said she was not the Tenten he knew. She couldn't help but wonder, what happened to this world's Tenten? Perhaps she could help Menma find her one of these days. It would be weird for there to be two Tentens, but from what Menma told her, the Tenten he knew was a klutz. Perhaps she could teach this world's Tenten how to be a better fighter should she ever find her.
(!)
In the real world, as Tenten already knew, she was tied and cocooned to the Shinju along with all her friends and family. Kaguya-hime smiled. The girl knew she was in an illusion, yet she chose to stay anyway. She was too far deep in it. This girl deserved a reward. Once she becomes a White Zetsu, would be one of her generals.
(!)
A year passed and Tenten's clothes disappeared. While she knew she was in an illusion, she had no idea what was going on in the real world.
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Another year passed and soon, her mind was being drained along with her chakra. Very slowly, everything that made her Tenten would be gone.
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As time passed, Tenten's jutsu slowly became forgotten as the use of her chakra . She couldn't remember how to perform her weapon jutsu anymore.
(!)
More of Tenten's chakra and mind became drained as more years went by. By this point, she started to resemble a mummy, dried and withered. She was also starting to lose her sense of self. And in its place, orders from a mysterious female voice began to replace the thoughts she lost. Orders on how to be a soldier. A general. One of thousands. Tenten absorbed these words into her brain. Perhaps she didn't need to be a shinobi after all to be a warrior.
(!)
The last image of her fantasy was her and Neji admiring their grandchildren grow up to be shinobi. After that, all of Tenten's will and personality was gone.
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What was left of Tenten now was nothing more than a dried up husk. But she did not die, but was being preserved for the next stage. Slowly, the cocoon began to tighten around her body, becoming like a second skin.
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A year later, the cocoon became so tight, that the outlines of facial features started to form.
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Another year passed, and the arms and legs started to form as well.
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Slowly, the cocoon began to peel away after another year. Then the body was disconnected. What fell to the ground was not Tenten anymore. The skin was chalk white, the hair was short and green and the eyes were yellow. This was one of millions of White Zetsus, a soldier created to obey Kaguya-hime, the goddess of the world. This particular Zetsu would become one of the thousands of generals that would lead the others into battle. And in the upcoming conflict with the two interloping descendants of Kaguya-hime, the general will lead the troops well. White Zetsu smiled with pride. Truly, this was definitely better than being Tenten.