More than anything the script is presenting a woman's world. With only women on stage, he suggests that families are, possibly more often than not, women's domains. If this is what he has in mind, he realizes his intentions extremely well.
If you follow her life as I have done and get glimpses of her as a child, teen, then adult star, you begin to see the essence of Garland. Sometimes it's hard to know where the screen persona ends and the private person begins.