Even if we consider the Met's Disciplinary Panel to be a reasonable arbiter, a finding of "not gross misconduct" is not equivalent to "a sensible decision". And that "if" is already doing a lot of heavy lifting.
The information available does not support this claimed dichotomy:
Ms Checa-Dover said in body-worn camera footage Miss A "was presenting as calm", adding that Child A "is seen some way from the door, further along the hallway" and "appears to pick something up - now understood to be shears - from the floor".
"The officer instructed her to put them down, which she did not do. She walked away from those present, moving up the stairs of the home.
"The officer didn't speak to Miss A to clarify the present situation or whether there was anyone else in the house; rather, he advanced into the house announcing he was a police officer with a Taser and soon thereafter using his Taser twice on her whilst she was on the stairs."
(my emphasis)