Quote Originally Posted by invision
you may have to let her dry out and let her start to wilt a bit before you water her again
Yeah, what invision said.
You might want to slice the sides of the pot, and put a shopping bag over the plant so she doesn't wilt too fast while the soil dries. I've had to do that with my Zygo cacti- they're prone to root rot- and I 've never lost one.