Assuming it is a female now, since I saw a baby version only just yesterday. Other years there have been one or two little ones around too. For some reason I thought of it as a he! I know it is the same blue-tongue for the stumpy-end/tail missing. This is not a rare occurence as often young blue-tongues can be taken for food source by the kookaburras. I guess this one was a hit, and miss. Lucky she escaped the full wrath, and lived on.
not a clear shot but depicts the damaged tail end