Unfortunately without more information I can't really answer your question fully but can give you some general information. You really need to have her sit down with an attorney. In person I could get all of the information I need to give her a much better understanding of her options and chances.
Tampering can be a felony or a misdemeanor depending on the circumstances. Probation is a possibility for either but will depend on exactly what she accused of doing as well as her criminal history, the county she is in and a number of other factors.