C.C.
Please understand that night time wetting is not due to any lack of trying on the child's part. Usually it's a physical issue, such as her bladder not quite growing as fast as the rest of her body. Help her understand that it is not her fault, and you know she is trying, etc. Wearing pull-ups at this age is really not a big deal, and it is probably WAY more traumatic for her to have to get out of bed in the middle of the night, watch you change the sheets, change out of her soggy pj's, wash up, change into new clothes, and get back into bed, than it is just to wear a darned pull-up! Also, wearing pull-ups will not mean that she is not potty trained. Night time dryness and potty training are two totally separate things.
My daughter (now 7) was fully potty trained at 24 months, and wet the bed at night until she was nearly 5. She hated that she had to wear a pull-up to bed, but we helped her understand that it was just that her little body wasn't cooperating with her, and was not her fault. There is nothing to be ashamed of with this issue. They grow out of it.