I was going to ask why she's so thirsty and drinking so much? Is the diluted squash sugar free and will she drink plain water too? Is she drinking for flavour, habit or thirst.
Ella's liquid intake is probably a quarter of Bella's apart from fruit and fruit packets, but she's 6 months younger so not at same stage. She tends to have either water or half water half pure orange, sometime pure orange juice undiluted (it lasts longer if I water it down though so saves on pennies
). Is Bella flooding the nappies, so they just can't cope with large pees all at once? If she's doing that she may have good bladder control and then just letting it all go when she needs a pee.