Starting Solids/Puree

My daughter will be 6 months next week. I have slowly been trying to start her on purees at 5.5 months. At first, she seemed quite interested in her baby oat cereal but I noticed more frequent (2-3 poops as opposed to her usual once a day bowel movement) mucousy poops after. So I stopped the cereal and introduced sweet potato and **** got a lot better. But now she's just not interested in eating anymore. Will refuse and close her mouth. She used to grab the spoon and shove it into her mouth but not anymore. She seems to not be interested anymore. What should I do?