She is One Mother, who is present everywhere. Divine Mother is also called the Cosmic Mother as she is present everywhere in this cosmos. She is maintaining & sustaining all this creation just like a mother takes care of her children. In general we call it Nature also. In our present day life, we are regularly facing Natural calamities of floods, storms, tsunamis, earthquakes etc. Then there is problem of global warming which is a great Natural problem of these days. Now all these calamities are a result of our ignorant acts due to which our Cosmic Mother is annoyed with us. We need to understand her true divine Cosmic Nature & pray to her so that natural calamities can be avoided.
"Ganesha went outdoors one day to play and found a stray cat. Too small to know better, he began to pull her ears and tail. He roughed up that poor cat and even began to beat her with a stick, making marks on her head till, yowling, she ran for her life. Some hours later Ganesha went into the house. His mother, to his astonishment and dismay, was looking terrible. Her hair was a mess, she had scratches on her face and she limped from the bruises on her body.
"Mother!" cried Ganesha. "Who beat you up?"
Sadly Sri Durga replied, "It was you, I'm afraid."
"No way! What do you mean? I never did it!"
"Do you remember, his mother asked, "a while ago, how you treated a certain cat?"
Now Ganesha thought that the cat's owner must have come and beat Mother Durga on account of him, and he burst into tears.
"Where is that man?" he sobbed.
"No, not that. You see, my boy, I am not just your physical mother. I have filled the Whole Universe with My Being. As a matter of fact, whatever you do to any least part of it, you do that to Me."
So from above story it is very clear that ,whatever, wrong we do to any creature in this world, we are doing it to the Cosmic Mother. With our bad & wrong actions towards other people & creatures of this world, Cosmic Mother becomes disturbed & gets annoyed with us. Due to Divine Cosmic Mother's annoyance only, Natural calamities occur & it's one way of Divine Mother to punish people for their wrongdoings.
In Bhagwat Gita also Lord Krishna says that He is there in this universe in many woman forms which are detailed below. This woman form of God is only called Cosmic Mother.
jagad viparivartate" (Bhagwat Gita: Chapter Nine verse 10)
"Lord Sri Krishna said: This Material Nature, which is one of My energies, is working under My direction, O Arjuna, producing all moving and nonmoving beings. Under its rule this manifestation is created and annihilated again and again."
"kirtih srir vak cha narinam
smritir medha dhrtih ksama" (Bhagwat Gita: Chapter Ten verse 34)
"Lord Sri Krishna said: Among women I am fame, fortune, fine speech, memory, intelligence, steadfastness and patience."
Great Indian saint Sri Ramakrishna Paramhansa used to worship the Divine Cosmic Mother at the temple of Dakshineshwar near Kolkata. It is said that stone statue of goddess in that temple used to take a live form & goddess in person used to talk to the great saint. So let's all pray to that Divine Cosmic Mother.