My mother had colonoscopy done 8 days ago today and has not had bowl movement since. went to emergency room and was told it's normal...is it?

Not normal: With the colonoscopy prep not unusual to not have a bm for 2-3 days afterward. Assuming your mother is eating regular meals and is not chronically constipated, she should have had a bm by now. She needs to call her GI doctor who performed the colonoscopy and ask for his recommendations. Probably not a serious issue. She can try 1-2 tbsp of milk of magnesia (magnesium hydroxide) as long as she is not having pain, fever.

Call her dr: Call the doctor who did the colonoscopy and discuss this with them. While it may be normal, they may have a way to make her bowels more normal.