First off I would suggest that you spay her. The aggression could be due to hormones and the reason that you have 2 females fighting. Females whether they are mother and daughter could and have fought to the death!
As for using a shock collar I would not suggest that route. But I would suggest that you try using the Bark Repeller. It works really well with ultrasonic sound waves. If you do a search on YT there are a lot of good feedback for using it for barking. Recently, I have tried it for behavior when Bogey and Doodlebug like to bit at my feet when I am in the yard. For the $15 including the shipping is might help. But I would also spay her and get her into some training classes.
Dog REPELLER BARK Trainer STOP BARKING! Dog Training! - eBay (item 360300878604 end time Sep-21-10 22:59:40 PDT)