Help with older sibling

Hi everyone-

Baby boy joined our family 8/26. My 4.5 year old daughter has been so excited but now that he’s here her attitude and behavior is garbage for lack for a better word.

My husband and I give her 1:1 attention, we include her in anything and everything but it’s not enough.

I’m at the point I want her in a timeout constantly and I’m done being sensitive to her. I know that’s the wrong mindset and I am trying to get out of it.

Any other tips or suggestions??? TIA!!!