Mother / the mother in her

Would you answer my question?
A : Susie calls on her 90-year-old mother in a nursing home every week.
Whenever she sees her mother speak like a little child, Susie feels she herself has mother in her, not daughter.

B : When Mary first saw Tom, a three-year-old orphan, who seemed helpless, she suddenly felt the mother rise in her heart.

Does "mother" in A mean a motherly disposition?
Does "the mother" in B mean a maternal instinct?
Are A and B correct in grammar?