Sense and Sensibility

Jane Austen beautifully establishes the profound connection and shared disposition between Mrs. Dashwood and her second daughter, Marianne, in the very first chapter of Sense and Sensibility:
“The resemblance between her and her mother was strikingly great.”
Austen expands on this by noting how both characters share an identical nature of feeling, which stands in contrast to Elinor's rationality: "Elinor saw, with concern, the excess of her sister's sensibility; but by Mrs. Dashwood it was valued and cherished. They encouraged each other now in the violence of their affliction." This iconic scene from the 1995 film adaptation perfectly embodies that shared, unrestrained emotional world.
Do you think Marianne’s intense romantic sensibility was purely an inherited trait from her mother, or was it primarily amplified because they constantly fed into each other's emotions?