at this age she is learning to express her emotions, and many times, it could come across as too loud. this is mainly because such small babies don't understand what is too much and how to tone down things.
also, as you mentioned the environment in the house is generally loud, this may come across as natural to her. i would suggest you speak to her in a soft voice, sit down to be level with her, and look her in the eye while speaking. try not to shout and stay patient, as doing this regularly will show her how she too can be a little quieter than what she is.
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