You can use the tool at the following link on the IRS web site to determine whether you can claim your granddaughter as a dependent.
Whom May I Claim as a Dependent?
If you are asking about 2023, select 2022 when the IRS tool asks what year you are asking about. The only difference is the gross income limit for a qualifying relative. For 2023 it is $4,700 instead of $4,400. If you are talking about a minor child (your granddaughter), it's not likely to make any difference. The child's gross income probably won't even come up.
