what exactly happened to Naruto's mom, Kushina Uzumaki?

WHEN yhey put the nine tails inside her she sacrificed herself to save her baby naruto but when i think naruto is fighting tobi and the nine tails appears so does his mother and itz so sweet they hug and cry and all that

She died cuz she gave the last of her chakra to naruto so that if he ever tryed to control the kyuubi she could help him and see him grown up.She was going to die anyways because of her injurys during the fight with the kyuubi.

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Kushina and Minato used up the last of their chakra to foca, selo part of the nine tails into naruto so they could save him and the village

with the nine tails inside kushina she volunteedred to sacrafice her life to kill the ninetails inside her taking her life also, but the foca, selo didnt work and the nnine tails was sealed inside of naruto and kushina died.