You should report the income as it may affect the tax due and there is a line number for it on the tax return.
If you knew how much she earned each month you can multiply that by 5 to get the amount. You may be able to look at her bank statements to determine this, as the check is normally direct deposited.
Another option would be to look on the previous year tax return and divide the amount for the year by 12 and then multiply by 5 to get an estimate for this year's amount.
As you said, it probably won't materially affect anything and the IRS knows the actual figure so they may adjust the return down the road if necessary.
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