She does not need a medical. You should inform IRCC, either by webform or whatever other contact.
One thing to check: did you include the daughter on the IMM0008 form as dependent? if so, you should revise that form and resubmit it (also by webform) with a short letter of explanation of mistake.
(If you read the imm0008 instructions carefully, it says citizens and PRs should not be included on that form - they can't apply to be PRs)