Sally Payson is a security guard at the Natural History Museum, where Grandpa Lou takes the kids. Sally is a loud, stern and strict guard of the museum. She considers Lou a nuisance for not listening to her rules. She's seen mostly chasing after him in "No Bones About It". While she sees him as a trouble-maker, Lou is really trying to find the babies after he loses them in the museum. In trying to "save" the tykes, he and the babies unintentionally and nearly destroy an exhibit. This leads to Sally ejecting the gang from the museum. However, when she herself accidentally causes the tyrannosaurus rex fossil exhibit to collapse, she is dismissed from her duties and arrested for excessive property damage, claiming innocence.
You can find Sally Payson gallery here.