Here's what I got from the following website <http://www.alkalinecookbook.com.au/newsletters_view.php?id=222>
"Your urine can tell you heaps about how well you’re doing on the inside. If the colour of your urine is anything but bright yellow it could be because of some kidney or liver disorder, and even cancer of the urinary tract.
Healthy urine is pale yellow in colour and has no offensive smell. Where does the yellow colour come from? An article published in the Medical Laboratory Observer made this comment “the yellow colour is due to the presence of urochrome, a product of endogenous metabolism. The amount excreted can vary depending on the person's metabolic state, with increased urochrome production during fasting states.”
If you drink too much water then your urine will probably be colourless. You may think that’s a good thing but drinking too much can stress your bladder and give you the inconvenience of having to constantly visit the toilet."
Her's was colourless, so she must have drank too much water & had to go wee-wee.