.... squeak, miaow & make so much noise when she is using the litter tray? Is it to encourage her sister (who is also very well trained), to inform me so I can parise her/tidy up after her, or some other reason?

Havent got a clue, but if it makes you feel better Molly ALWAYS announces when she is about to have a poo!! She will meow all the way to the litter tray, stand there for a minute or two and meow some more .... maybe it's a warning signal for mum and dad to hold their noses

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just letting you know that she is going, in the middle, then finished!
they also do it to mum to and littermates lol, find it quite sweet, however they do stop when they get older, well, mine have!

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I've got litter box chatterers too.

Hee hee Loki does this too, he's 10 months old now. I think it's cute!

The only warning you get that Sooty is going to the loo is the voilent noise of sand being flung across the bathroom floor and up the bathroom wall, before proceeding to do his business!

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Mummy to;

Sooty 9.6.1996 - 28.04.2011 Rest in peace my love!
Storm (Sueragdandy Phantom) 28.02.2010
Benji (Kassaro Benjamin Franklyn) 08.03.2011