She wants to keep a good relationship in the aprtment and is reliable.Plus if you watch the episode "Cyrano de Tripper" where Janet says "Well excuuuuuse me!",she sounds just like Reba.

http://www.sitcomsonline.com/boards/attachment.php?s=&postid=1782146

Interesting point. I never thought about that, but I will have to see my taping of the Reba episode. :D