I have 1 of those too!!!!!!!!! Jc is a devil-he screams the place down. I tried ignoring him,easier said than done when your head is pounding.
I reckon it's frustration at that age,because they start to toddle,crawl babble etc.....but don't master the skills properly( i'm no expert but think this was the case for my son)
All I did was let him play with noisy toys,try and involve him in his older brothers games and tried to talk to him quietly,he did once shut up to try and hear what I was saying!!!! Action songs are another 1 of his faves,keeps him quiet for a while-but there is only so many times you can sing 10 fat sausages!!!
I hope she calms down for you-I completely understand you hun x
Long walks are another fave of mine-wrap up and shut up time we call it!!!!!! Try and spot as many birds buses and trees as we can!!!!!