The History of Humāyūn (Gulbadan Begam) 28: XXII. Bachaka Khalifa.

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Gul-badan, Bachaka; Mems., Bachaka; Ilminsky, Bichka. Vambéry (Chaghataische Sprachstudien) has an appropriate word, bechek, Chok (? Kokand), zierrath, ornament. The name is presumably Chaghatai Turki, as the bearer of it was an old family servant of a Farghana household.
Bachaka was a head woman-servant (khalifa) of Babar's household, and was one of two women who escaped with his mother and him from Samarqand in 1501. There was a Bachaka whom Gul-badan calls a 'Khalifa of my royal father,’ lost at Chausa. in Kabul, and the two references may well be to the same woman.
Gul-badan, 114 Babar’s Note-book Mullu’s Note-book