Work with me here. Trying to be creative with names that reflect your description and her personality. Most of the name ideas will be lame
Since she stiffens…Stick
Since she’s defensive…D or Ball D (Pronounced Baldy because Piebald morph or D for defensive) or D Python (Pronounced ‘da python’ again the D is for Defensive)
Since she tags…Tag or Strike
Hope you find a great name! 