Is she an Indian resident? As you have posted question From Canada.
Sorry but due to some problem the amount you mentioned of her earning has been deleted by the website so could you mention it again? They might have deleted it because they might have found it as phone number.
However to give you broad understanding I would say she only needs to file income tax return if her total income after considering her expense comes above Rs 2.5 lakh a year and this expense won't include expense for studies.
If this is above 2.5 lakh then she can file income tax return under presumptive section and file income tax return even without maintaining books of accounts.
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