If you are using TurboTax Online:

1. When starting the return, complete the initial Personal info interview.
2. On the Tell us about your dependants screen, enter the info for your daughter and select Continue.
3. Complete the Personal info interview. This unlocks the Tax home screen.
4. From the Tax home screen, select Deductions, then Additional Dependant Information.
5. On the Tell us about your dependants screen, you can enter her details.

Please see these TurboTax Canada FAQs for instructions on how to enter medical expenses for your adult daughter: How do I enter medical expenses for dependants aged 18 or over?