My sister is currently in canada with a visiting visa,she is with her daughter who was born in canad

[Gentlegiant22]

Ques:can she file for and obtain landed immigrant status on the basis of the Canadian child who is an under aged child?

 

[Bs65]

No she will have to apply and qualify like anyone else as having a Canadian child is not really any benefit at least until they reach majority age when they could possibly sponsor her.

 

[Rob_TO]

Ques:can she file for and obtain landed immigrant status on the basis of the Canadian child who is an under aged child?

No.
If she can't maintain her status in Canada, it's expected the child would return with mother to her home country.