Your daughter surely didn't have swallowed pointy tack as you are suspecting or at least it has been passed through stool safely. It has been already 5 weeks. If she is not complaining about acute pain in stomach or not passing blood in stool/ blood stained stool or blood stained vomit (that indicates injury
in gastrointestinal track) or blood in sputum (that indicates injury inside or around mouth cavity/ throat), there are hardly any chances of tack inside her body. However, if you want you can go for plain X-ray (chest and abdomen) or Barium meal
, stomach and duodenum
to rule out its presence.