Siqua has had many confrontations with Gaster, and has questioned him many, many times. However, she has always considered herself his friend. One of her biggest faults as a character is her blind trust in her friend, so much so that even when provided evidence straight from his mouth that Gaster is an unfit parent, she purposefully chooses to soothe herself with the idea that it is just in her head. Today, however, I think she has changed her mind. :)