The amount available for transfer is based on the students taxable income. It is possible that she had to use tuition credits on her own return to reduce tax payable to zero. This could be the case if her employment income was high then $11809.

If she is reporting income from Box 105 on a T4A slip make sure to choose the Box 105 that meets her particular education situation. There are multiple boxes to choose from and each has different consequences on the tax return.