Yes, she waived her fourth amendment rights when she went on probation.
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Read the terms of her probation. It likely says something like: Submit to search and seizure conditions (Which means police or probation may search day or night with or without a warrant). She still has a right to not be subject to unreasonable search and seizure (searching every hour of the day, for example), however, when you are on probation, your expectation of privacy is at a low point. As they say probation is a privilege. You give up something to get something. AND one has to AGREE to probation terms. If you don't, the only other option is prison.
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