
I'm not sure what crime she could be done under, as I understand it, the law regarding hunting with dogs, doesn't apply unless the animal was being deliberately hunted, which obviously wasn't the case.
The DDA seems only to apply if the animal is owned
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Poor lady, it can easily happen, a deer popped up right under Daisy's nose just a few days ago and got caught between her and the fence, thankfully it was a big hind and Daisy thought better of it, but normally she never bothers about deer, this one was just to close to ignore.
As has been mentioned, a call to Trevor Cooper would be advisable.