A Ukrainian girl sang ‘Let It Go’ in a Kyiv bunker. She just performed for thousands in Poland.

Wearing a white folk dress embroidered with red, white and blue flowers, Amelia took center stage and sang Ukraine’s anthem, “Ще не вмерла України,” meaning “Ukraine has not yet perished.”

Weeks earlier, in the early days of Russia’s invasion of Ukraine, she sang in the same clear, high-pitched voice, “Не боюсь ничего уже” — Russian for “I’m not afraid of anything anymore” — as explosions could be heard overhead.

A Ukrainian girl sang ‘Let It Go’ in a bomb shelter. Millions listened, among them ‘Frozen’ star Idina Menzel.

The video was viewed by millions of people, even reaching the cast of “Frozen.”

“We see you,” American actress and singer Idina Menzel, who was the voice of the character Elsa in the movie, tweeted on March 7. “We really, really see you.” She shared a clip of the girl and two heart emoji — one blue and one yellow, the colors of the Ukrainian flag.

In Poland, Amelia later came back onstage to sing with Ukrainian performer Tina Karol, against a backdrop of sunflowers, Ukraine’s national flower.

According to ITV, the concert at the Atlas Arena in Lodz, “Together for Ukraine,” was organized to raise money for Polish Humanitarian Action, a nonprofit that has provided services to Ukrainian refugees at the Polish border in recent weeks.

The event raised over $380,000 from viewers, according to the Associated Press. Ukrainian outlet TCH reported that tickets for the arena’s 10,000 seats sold out.

The sunflower, Ukraine’s national flower, is becoming a global symbol of solidarity

More than 3.5 million Ukrainians have become refugees since Russia’s invasion of their country, according to new figures released Tuesday.

More than 2 million of them have fled to Poland — in some cases, overwhelming cities and institutions not designed to absorb them.

One of those refugees is Amelia, who told the BBC last week that she was in Poland with her grandmother. Her father stayed in Ukraine, where, under martial law, men of fighting age cannot leave the country. Her mother, Lilia, later joined them, telling Britain’s Press Association news agency that she was “proud” of her daughter’s performance in Lodz.

“Everyone was worried that she would be very worried, but she did great,” she said after the concert. “When Amelia went to the stage, you could hear her say into the microphone ‘nightmare, nightmare’ but she reconciled [those] feelings and sang.”

“Her happy grandmother Vera was watching in the hall,” she also told the PA news agency. “Is there a grandmother out there who would not be proud of her granddaughter in that moment?”

Jennifer Hassan contributed to this report.