It is probably not a surprise that exploring the mysterious maternal line in a Birth Chart is complicated.
We look at the 12th House to explore the pre-natal( last trimester) influences, which can be quite powerful. What was Mother thinking, feeling experiencing that got transmitted to you?
The Moon(Sign and House) and all her relationships are unpacked. She-the Moon-in your Natal Chart will show the emotional/ psychological influences that will leave an imprint.
Ceres, the Great Mother Goddess(Sign and House) and all her relationships to other Planets will reveal nurturing styles; plus attachment/detachment issues.
And, Venus our Goddess of Love(Sign and Houses) and all her relationships will offer her story on Mother's heart.
This is a snapshot but yes Mothers are powerful, mysterious and magical. Consider this: your heart beat, beat in perfect rhythm to your Mother's heart beat while you were in her womb.The Mother/child relationship is complex and the most unique relationship any of us will have.