A thunder shirt can help. The only way to tell is to get the dog one, then WAIT until the dog is acting fearful. Putting it on before hand will desensitize the dog to the feeling of the shirt, and render it useless. The "all over" feeling of the shirt causes the dog to focus on the body stimulation, and not the environment. don't over use them, and never put it on in advance.
Mild sedatives can help. A common one is Benadryl. For an adult Mal, try two every four hours. Your vet may be able to prescribe something stronger.
You should act as if the fireworks are very cool.. clap your hands, smile, laugh while they are going on. Go out in the yard with the dog,eat, try to play, etc. Try not to act fearful yourself during them. Do not try to soothe, or comfort her with stroking, or soft words. That will only cement her idea that they really are bad. If all else fails, a crate in a room with no view of the fireworks, (may have to paper over the window so no flashes, etc can be seen) a fan on high, and a radio blaring helps! Now that the fireworks should be done, getting her out to the yard, playing, eating, is the best thing to do. Be proactively interactive.. so she sees that everyone is back to normal.