If you and she aren't ready, simply don't wean. Don't do it because of pressure from anyone else. I practiced "child-led-weaning" where my daughter told me when she was ready to stop. I figured she would just slack off and stop, but what happened was she ended up nursing only on her preferred side after my supply dwindled and she was mostly "comfort nursing."
I started cutting out daytime feeding by distracting her a lot because I was "touched out" and didn't like the fact that she was 2 and 3 years old and feeling like she was in control of my body and not me.
She nursed for the last 6 months only before bed and then one night (it was Valentine's Day!) she said, "Mommy, I'm a big girl and I'm going to quit nursing now." It was very sad for me, and I honestly think it was due to pressure from my family about what she had heard them say about it, which I really regret- but it worked out just fine in the end. (She was 3.5 yrs)
If you would like to speak with other moms who are nursing, weaning, or "extended breastfeed," there is a great discussion forum here: http://www.mothering.com/discussions/index.php
There are also several Yahoo groups that deal with these issues that I found helpful when nursing.
And, kudos to you for nursing so long!! I think it is awesome!
Amanda
aspiring IBCLC