2yr old DD has dreadfully matted hair - anything I can do?

[CousinBotony]

My DD2 has beautiful curly hair that is very long when wet. However, after few days of it getting wet and not brushing it out properly the underneath has really matted and gone knotty. I have a tangle teaser and put on loads of conditioner last night and had a good go at it, but it is still terrible.

She cries and cries when I try to brush it out, but to be honest it is so matted I dont think I am every going to get the knots out.

Does anyone have any tips/suggestions for a wonder product before I cut the matted bit out?

I'm with BiscuitNibbler on the not brushing. I used to cry as a child having a brush through my hair and all I had was a big ball of frizzy fluff. I don't own a brush now.
Wash it, loads of conditioner and use a wide tooth comb or fingers. Then I put some curl cream on (I just rake it through with my fingers) or detangler and leave it

Use the Curly Girl method -- no shampoo, just conditioner, no brushing, ever. You can get even the knottiest tangles out gently using your fingers when it is soaked in conditioner.

And you can plait it at night to keep it from getting tangled by nocturnal tossing and turning.