Every Mother takes different forms every day. She becomes cook when cooking food for children. Becomes aaya while cleaning the child. Becomes teacher when teaches child. In different forms, she does different activities.
Goddess Lakshmi Devi gives wealth - means not money, everything which makes us happy and comfortable. Goddess Saraswati gives education/knowledge.
When Goddess Lalithadevi fought with Demon Bhandasura, Goddess Varahidevi was Defence Minister and Goddess Syamaladevi was Chief Minister.
Varahidevi is a form of Lakshmi Devi and Syamala Devi is a form of Saraswati Devi.
These two fought with Visukra, Vishamga, brothers of Bhandasura, and others and killed them.
Even Balatripurasundari, 9 years old Goddess, participated in war and killed all sons of Bhandasura.
Same form will not do all activities.