Your current manager is very much aware that you are an intelligent and capable lady who could have gone through the list and found the problem. Your manager gave her the task to see if she can do it properly. Your manager is going to be testing all of you because of the job opening that will be coming along.
I will offer up this little bit of advice, when the brown noser comes to you for help and/or info, just give her enough info so that she actually has to go searching on her own. I use to do this and then I would follow up my conversation w/that person with an email with a cc to my manager so that they knew that I had given this person some help. But that is up to you as to how you want to handle little Miss Brown Nose.
It's the weekend. Try to relax just a bit and give your leg a much needed rest.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
