No, and I wouldn't use one. If you don't want her to bark in the garden, make sure you supervise her. If she barks, she instantly has to come back in. Keep her in for a minute or so, and let her back out again. If she barks again, get her back in, etc etc. She will soon learn that barking in the garden means she can't stay out there, and will learn some self control.

You could also teach her the 'speak' and 'quiet' commands.