Sorry for your loss. Yes, you can claim her as a dependant. Canada Revenue says:
Line 367 - Amount for children born in 1997 or
later
You can claim $2,255 for each of your or your spouse's or common-law partner's children who are under 18
years of age at the end of the year.
You may be eligible to claim the family
caregiver amount for each child with an impairment in physical or mental
functions.
The full amount can be claimed in the year of the child's birth, death, or
adoption
