Tell her momma if the girl cant comb her hair and the mom won't do it, it needs to be cut.

THEY SHOULD BE ASHAMED OF THEMSELVES!  There isn't anything else you could do except feel sorry for that girl that she has lame parents that would let her hair get like that.

There is one word that describes that:

NASTY

Vally, you are so sweet because you never think the worst.  The fact is, I have seen hair like this.  Hair can only get this way by not combing it.  For MONTHS.  Hair is not going to tangle and matt all the way to the scalp if it is washed and combed at least once a week!  You can deep condition all you want, the tangles are not going to come out.  I had a girl like that years ago.  It took me TWO HOURS to comb.  I gave up and told them to go somewhere else- it was FREAKING RIDICULOUS. 

Then more recently I had an older lady- bless her heart she would just throw it up in a bun- never comb it.  I cut it off... It took me an hour just to work it away from her scalp so she would have at least 2 inches of hair after I cut it!  She admitted that she can't comb her hair and no one to comb it for her.  It was her idea to cut it short so it wouldn't be a problem.

so yeah, THE PARENTS didn't want to comb her hair- maybe she was a whiner that cried and they didn't want to deal with it.

The trick with that kind of hair is to mist it lightly with water, and add a really good detangler + conditioner. Then comb, comb, comb.  I get alot of these clients, especially girls of mixed ethnicity b-cuz the parents don't know how to mange their child's hair.   To comb it out, I charge by the hour and the time is rounded up to the nearest 1/2 hr.  Then, on top of that, the client is charged for whatever service they receive( usu. a wash/blowdry/flatiron).  I always explain the costs B4 I begin, so there's no confusion on what they're being charged for.