A related discussion, How to stop bed wetting, did this work for you ? was started.
Generally, there is no emotional cause of nocturnal enuresis. A percentage of children, more boys than girls, remain enuretic at night at her age. The problem will likely resolve over time, but if she is interested in improvement two interventions can prove helpful: (a)medication - which her pediatrician can tell you about (there are several) and (b) so-called wet-stop alarms. She's at a good age for either approach.