Sorrell Leczkowski was killed at the Ariana Grande concert at Manchester Arena on Monday.
Sorrell was a pupil at Allerton High in Leeds and is from Adel in Leeds.
Her mum Samantha and her grandmother are also both in hospital receiving treatment.
Her grandmother is critically ill.
A crowdfunding appeal has been set up to raise money for Sorrell's mother.
Around £6,000 has been raised for the family so far.
To donate to the appeal, go to https://www.justgiving.com/crowdfunding/sarah-smith-123