Hi patriciamason201,
We are unable to reverse the deleted transaction. Instead, you can enter it back to QuickBooks Online. You can refer to the Audit Log for the information you need on the deleted transaction.
Then mark the transaction as reconciled.
Now, you are ready to reconcile your credit card account.
You can also check this article about fixing the opening balance to match the bank statement.
Add a comment if you need anything else.