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It makes sense that Wellmy didn't notice her sister and everyone around her sister knew that she was doing everything to protect Iora. Wellmy was too focus and getting her sister out of their house to save her, her mind was just looking through a narrow pathway.
Just like how the Head Mage said, Wellmy has no one to rely on, and if there was another person on Wellmy said with fresh eyes or saw more then just her only goal of saving Iora, Wellmy would have notice.
But like they say, smart people don't except themselves to be out smarted. A quote from Dr. STONE.