Answer
(Fatwa: 2152/1247/H=1432)
(1) If she is not adult, her fardh hajj shall not be valid.
(2) It is not necessary to wait.
(3) Take her with you. She would do the rituals of hajj. However, by performing hajj in the age of nonage the hajj shall be considered nafli. Later when she attains puberty if hajj becomes fardh on her, she shall perform hajj, otherwise not. However, if hajj has become fardh on you then you should not make more delay due to your daughter.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband