In the context of the commands, it is likely that Ruth was far enough away not to hear Boaz's instructions. Alternate translation: "And when Ruth got up to gather up grain, Boaz privately told his young men"
Here "even" denotes "above and beyond what one normally does." Boaz instructs his workers to let Ruth glean around the bundles of grain. People who were gleaning were normally forbidden from working that close to the harvested grain.
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