Amending Federal and State 2024 return

I efiled both Federal and State return.  Federal processed refund.  I'm still waiting for State of California to process refund which could take up to 3 months according to their policy.   

 I need to amend both Federal and State returns because I inadvertently misread the question about my daughter who is a dependent which would have given me a bigger refund on both returns

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1.  Can I go ahead and amend Federal return? 

2.  Do I need to send State a copy of the amended Federal 1040x?

3.  Can I amend State return while they are still processing it?   

Please advise.  Thank you