I’m a bit confused. I suppose that SWD means “short wave diathermy?” SWD is a rather ancient term for the more-commonly-used term “thermolysis.” My guess, based on the terminology she’s using, is that your 30-year veteran has not kept up with the significant advances in thermolysis. Let’s put it this way: Today’s SWD is not our grandmother’s SWD!
Furthermore, virtually every electrologist today uses thermolysis for upper lip hairs … it’s the standard (even for people who use other methods, such as the blend). This is especially true for small upper lip hairs. Then again, maybe your electrologist thinks that your hairs are too small to treat … and, doesn’t want to do it?