3 year old and 6 weeks old advice

Anyone with 2 young kids have any advice for me please.
Since my 6 weeks old boy was born my 3 year old girl is so jealous which I kind of knew might happen but I didn't know it would be so bad.
When baby needs a feed she gets so angry cause she knows I won't give her attention anymore. She sometimes bites me or hits me or even tries to go for the baby.
I've tried getting her involved by letting her feed baby with me, letting her put the sterilised bottles on the steriliser and I've even had one on one time with her doing stuff we love whilst her dad stays with the little one.
Ive tried a lot that Google had said and also looked at NHS about it but nothing seems to be working.
The more attention I give her the worse she becomes.
Any suggestions out there on what you did and how long this will last?

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