If the child cannot live without being kept alive artificially--hooked up to machines--then you can morally disconnect the machines.
By keeping her going when she can't live anyway, you may in fact be acting against what God's intention is for her (i.e., to die)
Yet, if it is true that this baby girl is breathing on her own, then there porbably is a stronger-than-natural possibilty that her life may be prolonged by ADONAI's Hand.
But, if other portions of her body require (as you graciously implied) artificial life support to ensure ANY hope of her living...
...then, I do not object to discontinuation of machine support.
I will always trust in My Savior that, in HIS Kingdom, the girl will be so radiantly beautiful and alive and free from corruption.