probably the wax she used was a bad kind, coz there's an oil based wax and a water based one depending on her skin type, if sensitive etc. and there is no one with tougher hair than mine!hehe.and dawn9800 is right, exfoliating does help...if the apricot scrub doesn't work, i don't know if you have it in salons where you live but if you do find a salon that offers Moroccan Bath i suggest she try it, it consists of moroccan bath soap extracted from olives and alot of steam...or get the stuff and do it at home, you need a very rough glove or loofah and the moroccan soap. it's honestly the best thing ever!it's the ultimate exfoliator

and it's from neck to toe... and i don't think it's expensive.it'll get rid of most of those pimples, some are ingrown hairs and clear off aaall dead skin and impurities, plus the skin feels so smooth and looks great after. unfortunately laser is expensive where i live (Dubai), and it didn't help me, but that's coz i have pcos.hormone imbalance+laser=more and tougher hair...but that's just meee hehe.
take care