We never had overnight problems. DD wore Pampers Baby Dry diapers until she was 3 (size 4).
We used Huggies pull-ups, but I think they would actually be worse than a diaper b/c they don't seem to hold as much to me.
They do make diaper doublers which are an insert you can put inside a diaper to absorb more liquid.
Another idea, does she pee a ...



