My son disappeared when he was little (4 yrs old) for 3 hours and I almost lost my mind. He had wondered off in a field with my sister's adventurous cocker spaniel. Sheriff's plane went up & they found him real easy as he had bright colored clothes on. The police car rolled up at my house with what looked like 15 police inside and there he was in the middle of them. He got out and looked around as if to say "What's all the fuss about?" The next day I had to take him to the Dr as his wee wee was swollen up. His pediatrician looked at him and said "Where have you been young man"? I told him what had happened the day before. Son piped up and said "Yeah, and the cow licked me!" I about died! He had poison ivy.
Doesn't matter how old they are, you still lose your mind when they disappear. So glad your niece was found safe. 
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