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In Oregon, the income of both parents is considered when determining the amount of child support the non-custodial parent pays. The child support calculator is here:
In these situations, a court will require the parent to prove why additional support is necessary and why she can't work. School is usually a reason for reduced working hours, but it is not allowed for her to quit completely, and put the burden on you.
It is likely that the judge will increase the support payment, but not as much as she wishes - she'll have to get a part time job or take out student loans to make ends meet.