Yes, she can get the tax refund even with zero income. This is due to the withholding calculations and an earned income tax credit. This is also because withholding is often calculated on a yearly basis As an individual who has been unemployed for a long time she will have more tax owed than is withheld.
Ask a tax professional, not people on this site who often just guess their answers. Tax refund on no income? If that is possible, the welfare system has really gone too far. Who is supporting you, who is feeding you? You want more unearned money?