We work with her to prepare our application to cover the points the case officer would be questioning. We learned it is better to over-prepare rather than submitting applications incomplete. If any visa application is incomplete or requires clarification, it can significantly delay the application's assessment.
We spent a few weeks making sure her child's application to be decision-ready. We pre-prepared answers to the possible questions raised by the case officer. This approach sped up the process, and the visa was approved two weeks after it was submitted.