What to tell boss/friend about sick leave for lipo (so she will leave me alone)?

When I had a TT/BL mid 2020 & male boss and just said I needed a "Procedure" & took 5 days sick leave, then worked from home (Covid). Now, for a revision & separate lipo procedure, I have a female boss that is a friend, but also a workaholic. What can I tell her so I can take 5 days sick leave (& so she will leave me alone)? I will be working remote after the sick time so she won't see me or results. We talk about other health issues, so just saying "Procedure" won't be enough.