We have been trying to "bell train" Willow.
I think I can officially say it's working.
We have bells hanging from our front door. The idea is that she will ring the bell when she has to go out.
She has been ringing it randomly for a few days now. Today she has rung it several times and each time she's gone out, went to the bathroom, and then came right back in.
She's a genius. :)
Now if we could just bell train our KIDS at night....