How long can a mother still smell it's offspring after seperation?

Factual Questions
1

When animals are taken from their mother, how long can the mother remember the scent of her offspring? 6 months, a year, a lifetime?
Is there some indelible mark that she remembers forever?

Thanks

2

A mother “what”?

:confused:

3

Suppose a puppy is taken from it’s mother at 6 weeks old. How long will the mother of the puppy remember the scent and know that it is “her puppy?”