Can our mother host my sister's bridal shower?

I have heard that it is not proper etiquette for the mother of the bride to host a bridal shower but I feel in this case it is perfectly fine considering my sister and my mother truly are best friends. My mother is convinced that we can't give credit to her even though she is doing a lot of the work and providing a lot of ideas and monetary offerings towards the shower. What do you guys and gals think?