It does not appear that a private scholarship would affect her aid she was awarded. The scholarships she is applying for is small.
This is from the BU website.
“Federal regulations require a reduction in aid when total aid from all sources exceeds calculated financial eligibility. Our policy is to help you receive the maximum financial advantage: we will not reduce your BU need-based aid when you receive private scholarships unless required to by this federal law. If a reduction is required, any self-help assistance (subsidized loans and/or Federal Work-Study) will be reduced before your scholarship assistance.”