E.L.
In my experience Kushies will work if she starts to wet and then stops, but are not absorbent enough to hold a full toddler pee. My 5 1/2 year old still wets the bed, so we put him in Happy Heiny's Pocket Trainers at night. They're only $15.95 each. They don't come with inserts but you can stuff them with literally ANYTHING absorbent - even kitchen towels or something. I stuff mine with one microfiber insert and a couple hemp inserts or a hemp prefold. Another thing I like about them is I can stuff them and snap the sides together and then he can put them on and take them off himself, unlike a diaper. Also they go up to very big sizes. He's 45 lbs and a "one-size" cloth diaper would not fit him at this point.
If you have any more questions or would like to see a Happy Heiny's pocket trainer in person, you are welcome to stop by my cloth diaper store, Babies Bottoms and More (www.babiesbottomsandmore.com). We're in Farmers Branch and are open on Saturdays.