i think that because she is already in a very noisy environment most of the time, she too has developed a natural tendency of being loud. it is her way of coping with people and things around her, and definitely should not mean that she is someone who needs to be tamed down.
i think you will have to do a little bit more work with her and spend quality time in a quieter space with her. maybe take her out for the weekend sometimes, or just keep her with you in your room and talk to her calmly and nicely. when she throws a tantrum, don't be angry and dont shout at her, but tell her nicely that you love her and help her to calm down. it will take time and patience but please keep on trying.
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