OP - I'd let her sleep. She will wake and let you know if the wet nappy is bothering her and it will mean a small amount of extra washing if she wets through, but honestly, would you even notice? Enjoy that she is sleeping well because she may not do it again tomorrow

DS has slept 9 hours overnight in a greenkids nappy with extra booster without wetting through. And the inner material drew the moisture away from his skin so he didn't feel wet when I changed him.