Get her a muzzle, as you propose. There's a real risk that she will be destroyed, by court order, and you prosecuted if she does it again. I had a standard poodle bitch ,only some 6 months old, who got out twice and all she did was jump up and 'play bite' a couple of people, not even puncturing the skin .No doubt she alarmed them .Bizarrely, she was declared dangerous by the magistrates . I only saved her life on appeal to the Crown Court. There she was saved, partly because the 'injuries' were so trivial but mainly because she had been kept, pending appeal, by an appointed kennel used by the police as a pound. The owner of the kennel told the court that, in his expert opinion after having her for some weeks, she presented no danger to anybody. Her behaviour had evidently been exaggerated and was essentially juvenile. My barrister was able to persuade the court to spare her.