Mother S. is luckily just one single creature and not as common as the things she reminds us of. She carries her fellow creature into the most uncommon, unbelievable places so you can find spiders at the north pole and under a stone in a lonly desert. She is the first one, the one that taught our ancestors the fear of spiders.
How to fight it
I believe that Mother S. lives somewhere in the realms of the [King Nightmare] where her powers are unknown. More annoying is the fundamental fear she left behind and that fear paralyzes us. Many people overcame that fear - I would not know any other way to deal with it. Except for Flame throwers of course.gab