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It is likely that your boss also had Covid. If she were masked with an N95 during your time in-person then your risk of exposure is small and you do not need to quarantine. On the other hand, if your boss was not masked during your interaction together, then I would suggest you get tested (around day 5 from exposure). Be aware that finding an appointment at a test center has become extremely difficult. The CDC guidelines state that if you are boosted then you simply can wear a mask (N95 mask) for the next 10 days, as long as you remain asymptomatic. If you become symptomatic, then you should stay home for 10 days.
The mask that is worn is protecting others from the exhaled breath of the person wearing the mask; so wearing a mask when you are not the one infected is not reducing your own risk from others who are not masked around you.