The 10-year-old already holds a Cho Dan Bo belt and in March will go for grading in a black belt.
When Mr Watson signed her up for classes about five years ago, it was so she could learn to look after herself.
‘It was for my own peace of mind, really,’ he said.
‘I wanted her to be able to defend herself if she ever came up against some undesirable people; I thought I would sleep better at night if she knew how to look after herself.’
Mr Watson said Trinity, who trains at ATI Martial Arts and Fitness in Midland, wanted to keep going.
‘She is going for her black belt but she has also expressed interest in branching out to other disciplines,’ he said.
He nominated her for the HBF Junior Sports Hero award because she was a dedicated exponent of her chosen sport and a caring fostering tutor to younger participants.