Hello and thank you for your question.
The obligation to pay child support is based on the relative time in which the child is in the care of each parent, but this is not affected by periods where the child is away from home for holidays, courses, etc, unless the child can be said to be living elsewhere on a permanent basis.
Keep in mind that child support is not just for day to day expenses which may disappear when the child is away, it is also applied for more fixed costs, such as accomodation costs, which continue whether the child is away or not, so it would not be reasonable for child support to simply cease when a child is away.
So in this case the answer is that her going on nine week course does not affect the obligation to pay child support.
However, there is no absolute obligation to pay for her course in addition to child support, so it would not be unreasonable to negotiate reduced payment of the course costs on the basis that the mother of the child should be applying some of the child support toward the course, and will otherwise benefit from the child's absence.
I trust this assists.
Good luck and please rate my answer.