Hi @DianeW777 - thanks for your reply.
I printed both the original return (after filing) and the amended return (before submitting to file — I won't submit it yet until I understand this correctly).
When looking at the summary on TurboTax Online, I see my federal refund is a total of the original amount (727) + the amended amount (276). See below:

On the printed Amendment, it reflects my original state refund amount (647) + the overpayment/new amount to be refunded (51), but I am not seeing it reflected in the summary on TTO like I do for Federal.

So with this concern, I just want to ensure that the state refund has not decreased from $647 to $51 but is indeed an addition to the original amount since it does not show in the TTO like it does for Federal. I hope I'm making sense.
Thank you!
Yes, it is in addition to the original refund. The amount previously refunded is 647 is being reflected appropriately on the amendment and the additional refund is $51 making the actual total the combined amount once the amendment was completed.
@mdsl1806