9 month old screaming and naughtiness

So my nine month old always communicated well,mimicking sounds and words effortlessly... Until now. 
Since about 8.5 months old she's been screaming. It all started when she wanted her dad's attention, but now it happens for different reasons and no obvious reasons. Checkups proved she's perfectly healthy I've tried all tips. How do I get this phase to be easier for all three of us. Especially my husband's ears. Haha. She also uses it to get upset when we need her to do something. And she refuses to be calm during nappy changes. She screams, cries, crawls away. It's a battle of horrors. Please assist