"Accepted" or "approved?" Those words do not mean the same thing. Where are you seeing the word "approved?"
https://ttlc.intuit.com/questions/2840013-does-accepted-mean-my-refund-is-approved
If you amended a federal tax return, it can take four months--often more--for the IRS to process it and issue your refund. State processing times vary.
You can watch for information here for the federal refund:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1