Tanya, getting the larger size might compensate for not getting the heavy wetter. It will give her more surface area to absorb the urine perhaps.
I wish I hadn't looked here last night. I didn't check my e-mail yesterday so had no idea about the stocking, but when I saw this I went to the site and ordered another Bubblebub which we cannot really afford ATM. The crazy thing is I got it for my DSs who are TTing.