If she is convicted she has to advise the department that she has a criminal conviction. It is not major but it is a criminal conviction.
She should get a solicitor to represent her and seek the courts leniency and also that they give her a spent conviction meaning there is no criminal record.
It will not be refused because it is not a major criminal offence but it is a criminal offence.
For her to be refused and deported it has to be a substantial criminal record and that is explained in the following link
She does not have anything to worry about but it is best she has a solicitor and requests a spent conviction.
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