If someone doesn't have their preferences set to receive email of PM's and they don't check in here, they will not see a PM. I have found that sometimes things go on behind the scenes and out of our view when a member chooses to take some time off.
I was worried about her several weeks ago, but I saw that she does look in on the forum now and again... so clearly she's chosen not to post for her own reasons and we should not intrude on that...