Kids grow out of night wetting in their own time. Many of them will continue to wear pull-ups at night into elementary school. It is completely normal. You may hear many tricks to try, and in my opinion it is a waste of time. Withholding liquids after a certain time, waking them periodically, etc. doesn't really do anything for the fact that they won't wake up when they have to go.
For me, Jane was dry at night by now, but it took Michael until kindergarten. Joey is wet at least half the time. A number of Jane's friends took until 1st or 2nd grade, and a handful of kids I know were still night wetting through 4th or 5th grade. I don't think it is considered a problem medically until they are 12.
My suggestion is to just continue using pull-ups until she is staying dry for 2+ weeks at a time or more, and not worry about it or make any big deal to her.
I was really hoping she would be out of Pullups at night when she starts school next year.
One day out of the blue Vincent just started going on his own the morning and not any more at night.
Blake potty trained when he was 2 1/2 and up until two months ago he was in a pull-up/diaper at night.