Yes, but if she is unsure of how many she took, you know that they can do a blood test in the hospital to determine the exact amount of acetaminophen in the blood stream and can administer NAC if necessary. As a nurse, you know that any suspected paracetamol overdose, especially one where the exact amount ingested is unknown, should be treated as an emergency and evaluated by a physician. I am sure she will be fine, but you should contact a doctor and discuss it to be safe. Like I said, symptoms of paracetamol poisoning may take 24 hours to appear, at which point it may be too late to do anything. If you have any real reason to believe that more than just a few tablets were taken, please get her checked out.