Take another look at the sentence:
Tucked into a secret purse pocket, Larissa used her last five-dollar bill to buy a slice of pepperoni pizza and large iced tea.
Tucked into a secret purse pocket, a participle phrase, is right next to Larissa, an illogical target. A woman cannot be tucked into a purse pocket!
Before you continue, review the rules for misplaced and dangling modifiers.