i think most girls can do it.. all the girls i'v fingered (including myself) can... you have to just insert a finger or two a couple inches in and find the G-spot. then just sorta curl your fingers against it in a like beckoning motion. this has worked for me... takes a while tho and they should be v aroused first. good luck!
"All hope abandon, ye who enter here!"
~ Dante Alighieri ~