Potty training

Any one got any advice for potty training a girl because I am seriously at my wits end.  She just isn't getting it.  We have talked about it, read books about it, had our most private moments viewed by little eyes and nada.  We've also tried bribing, to no avail.  I know she will eventually be potty trained but for the love of Pete she just turned three!  According to family lore I was trained by 18 months.  I was also being taken care of by my grandmother while my mother worked and she already had four kids under her potty training belt.  Why isn't she picking up on this?  I have tried everything I can think of and I am seriously scared for the future of our carpet and upholstered furniture.