TurboTax can't use "Represent a Client" to import data from the CRA. TurboTax is meant to be used by regular individuals to do their taxes with, so it only uses My Account for Auto-Fill (and NETFILE, not EFILE).
If you are not able to access your parents' My Account, then yes, you will need to manually input her information.
Thank you for choosing TurboTax.