She falls into a Temporal Petrification Trap.

Kushina forcefully opened the door to one of the Academy's Classrooms but then checking it she discovered that it was also empty, so she left and tried to think of where else the woman with gray-violet eyes could find some clothes to cover her nakedness since Kushina wasn't thinking about returning home in her birthday suit.

Kushina: Of course, the Academy Warehouse -- Kushina said as she bumped her fist with the palm of her other hand as she remembered that in the Konoha Academy Warehouse and in the north and south sections of the building there were places where teachers and Students kept their uniforms and spare clothes.

[30 minutes later]

Kushina couldn't help but mentally curse herself when she remembered that the Shinobi Academy Warehouse was outside the building and to get to that place she had to go out and turn east to get to the Warehouse, so the red-haired woman opened the door and left. From the Academy, he headed towards the training yard and began running towards the east side of the school.

[Timeskip]

Being very cold and feeling like her feet were freezing, Kushina had to concentrate a lot of her Chakra to stay warm, to which she was also grateful that once her Shadow Clones had completed their jobs, they disappeared and the naked woman received. both the memories and experience of the copies of him that Kushina stopped at when he arrived at the Konoha Academy Warehouse.

Kushina: Yes, I finally reached the warehouse -- Kushina said that right after opening the door she did not see the trap that she stepped on with her foot when entering and was activated by reacting and sensing the Uzumaki woman's Chakra.

BOOM!!!

The resulting explosion of smoke that was unleashed the moment he activated the trap and covered Kushina once dispersed, due to the wind it was seen how instead of the red-haired woman there was now a statue of Uzumaki Kushina completely naked posing as a dancer ballet but what really happened was that the woman with gray-violet eyes fell into a trap that petrified her and transformed her into a statue temporarily....