Some people noticed that Ucchi was conspicuous by her absence in today's Best Hits Kayousai performance of Eien Pressure.
Here's what she was doing instead:

"Aishou Batchiri". I think it's a stage play set in a restaurant.
Of course, I could be wrong, here's the source:
http://www.sanspo.com/geino/news/20121123/akb12112305020000-n1.html