Spoiler alert
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She didn't lose the kid. The kid deliberately left her there and snuck away, which was always the plan. Pardus is working for Voletti and Philleo wants to meet Varia but they have to leave no trace of their meeting being intentional. That's why the the Pardus kid left her there and Philleo told Leo to go to the ice cream store, so she could bring Varia back with her.

she lost that kid she could t find them and now sister dram?!? give our og fl a break!