''re, le, min, ming'' and others

I have 2 mic staff who are now deployed as foremen, and i've been having 1-on-1 classes with the guy. Recently, the girl joined me and at the start, i wanted to throw up my hands in despair.

The guy is ok, though sometimes he can't pronounce certain words the way i'm used to pronouncing them or hearing them pronounced. I don't know how to teach him, because he can hear the difference when i pronounce the words, but when he pronounces them he can't hear the difference, and so he mispronounces them. But for him, its generally still acceptable -- you can hear the very obvious accent, but its comprehendable -- and i suppose he will improve with more practice.

For the girl, i have no idea what to do with her. She started by asking me to phrase a request in English, so i replied.
Please switch on le lights.
No, no! The! The! The! Not le! Please switch on the lights!
Please switch on le lights!
No, THE! Not le!
Le!
*pull hair* ok, never mind. Try this -- the lights on the right side.
Le light on le light side.
THE Light on THE Right side!
Le Light on Le Light side!
Right!
Light!
Rrrrrr-right!
Lllll-Lu-wight!

Oh my goodness! So i switched tactics. It works for the other guy, and it worked the last time with Daisuke, so i told her to try:
hen re (very hot). Kuai le (happy).
hen le. kuai le.
*gasp* hen re! kuai le!
hen le! kuai le!

Giving up, i told her to practice her re and le at home. I decided then to go through the alphabet, and when she came to ''S'', it was ''ass-suh''. Anyway, there were also lots of others, such as ''emm-muh'', ''elle-luh'', ''hey-chee''. sigh.
No, its ''ass'', not ''ass-suh''. You try? Ass. Swimming.
Ass-suh. Suimmin.
*gasp* ing! not in! Ming tian. Xia Min.
in! in! min tian! Xia Ming!

My goodness! She's MIC! And my mandarin is an E8 standard! So how can i possibly teach her to speak her own mother tongue! XM was there by then, and i asked him to explain to her how to pronounce. But in the end, his conclusion is that how she pronounces is a characteristic of her province.

That led to a discussion on my own pronunciation, and they both agreed that i speak rather like the northerners eg from Beijing, cos of my ability to speak with an ''er'' such as ''dai hui'r jian''. For MH, she pronounces it as ''dai hui er jian''.

I really don't know how to get her to speak properly, if that was how she was taught in school and if she can't even pronounce words that are in her own language. btw, she can hear it when i say re and le, but when she pronounces them, they sound alike to her.

How? Die la...