Constipation and when pooped blood comes

Hi, My daughter some days earlier started constipation problem, as she didn't pooped 2 days, then gave her Lactihep plus syrup, after that she pooped next morning, now Nux Vomica 30 homeopathic medicine is given, as there is no fixed time poop comes. From last 2 days slight hard poop came and then again Lactihep plus was given during night. The next morning poop was normal but she slightly bleeded few drops of blood. This happens after few months or a year once. Please recommend some medicine or something that can eliminate this problem at an earliest. Few days back she got burn sensation during urination, but we showed to a doctor, that is fine now, but constipation has not gone. Thanks & Regards.