No doubt poor old Alan Craddock will get the blame.
The important point is that Craddock coloured her the same as her mum*. And
Fading Of The Light and
Cadet make a point of saying she's the spitting image of her mum. So, the correct answer to the question
'what colour should Judge Beeny's skin be?' is '
the same colour as her mum'.
Just as a general point of order, Beeny's half Puerto Rican and half ginger. She could legitimately have been portrayed as either or anywhere in-between, but since her resemblance to her Maw is a story point, let's go ahead and say the current situation is probably right.
Although, of course, nobody (even MacNeil)
really draws her looking much like her mum at all. MacNeil's art on
America is beautiful beyond words, but his character design for Ami is so odd - a product of his style and the media he was using - not even he can draw the character in that way anymore.
* Well, her dad, but in her mum's body ...