If she now paints more often as a means of maintaining her skills through increased practice. This is an example of: optimization.
Optimization can be defined as the process of maximizing your potentials so as to acheive your goals.
Based on the scenario she is making use of optimization as this will enables her to maintain and improve her skills through constant practices so as to be perfect in what she does which is painting.
Inconclusion this is an example of: optimization.
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