First, she cannot enter unless she gets a derivative visa which she cannot get any sooner than your visa is approved. Second, you should not be that concerned. Once she has a visa, every major airline offers service nowadays for unaccompanied minors.
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You will need approval of your visa before you can apply for your daughter. It is best to consult your employer's immigration attorney.
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As my colleague pointed out ... all airlines have flight attendants that make sure young people change planes safely.
Or, you could go home to get your visa stamp ... which is the 'normal' thing to do.
This causes me to wonder why you're in the US on B visas waiting for your L approval ... this is not the normal thing to do.
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Wait for approval of the L visa then she may apply for the L-2 or depart the US and have the visas issue in Brazil.