When i have a bowel movement and i wipe there is a lot of blood on my toilet paper. why?

Many possibilities: Usually due to a hemorrhoid which is swollen vein around the anus, or a tear in the anal opening. Either problem can be caused by constipation and hard stools, and sometimes by diarrhea. Hemorrhoid medications will help this heal along with stool softeners to prevent any further hard stools. It is wise to have her doctor check it out, as it sometimes is coming from internal bleeding.