Katie Rough was found by police after they were called to a playing field half a mile from her home on Monday and rushed to hospital where she died a short while later.
The accused teenager, who cannot be named for legal reasons as she is still a minor, was remanded in custody at a "secure accommodation" by York magistrates and is due to appear at Leeds Crown Court on Friday.
She has also been charged with possession of an offensive weapon, a Stanley knife.
Both Prime Minister Theresa May and Opposition leader Jeremy Corbyn paid tributes to Katie in the House of Commons.
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Corbyn said "I'm sure the whole House will join in heartfelt condolences to the family and friends (following) the tragic death of seven-year-old Katie Rough in York earlier this week. I think it's right we send condolences to her family".
May said, "I also join you in expressing condolences to the family and friends of little Katie, who died so tragically".
Maggie Jackson from York said on the GoFundMe page that said she did not know the family but just wanted to do something for them.
She wrote, "The awful death of Katie the little 7-year-old girl in York has really saddened me, I can't stop thinking about what her mum and family will be going through. It has shocked the whole of York. I don't know if it's too early to say this but I'd like to raise money to give to her family to help them through this terrible time without any other worries".
Katie had been a bridesmaid at her parents' wedding just two weeks before her death.