My 8 month old was recently constipated to where we had to give her a suppository. She went right away. Now she has yellow seedy runny poop? Normal?

Yes. It is common to have looser stools after getting a suppository and the initial constipation is resolved, particularly if you were giving her lots of fruit juice or water over the past few days in an effort to treat the constipation. Make sure that she is urinating and acting normally, and that there is no blood in her stool. Her stools should be back to normal within a few days.