Your mum’s electrologist is probably not very good. She may have also be doing things like plucking/waxing alongside treatments. As I’ve seen many people do this, partly because the electrologist never explained to them why they shouldn’t.
I’m guessing you’re in the UK (coz of the word ‘mum’). Is the electrologist registered with the BIAE?
So far, I have had my upper lip, sideburns, eyebrows, coarse chin hairs all treated with electrolysis. It has been close to year since I’ve had any ‘proper’ treatment and the areas are still clear. I’ve had my underarms finished after Laser (there were still 20% hairs remaining after 6 Laser sessions). I’ve also had around my areola’s treated so no more coarse hairs around there since ages (only treated the coarse ones). I’ve had two clearances of my feet and toes for a dramatic reduction.
Don’t be fooled into thinking that Laser is any more permanent or effective. Even the best Laser treatments cannot beat the best electrolysis because Laser can only treat dark and coarse hairs, whereas electrolysis can permanently destroy all hair follicles.