Nothingburger.
Despite what Atlas and the media would have you believe, most state legislators have cordial cross-partisan relationships with one another. Cotham previously served in the NC House before making a comeback last year; it would not be unusual for her former Republican colleagues to reach out with words of support given her seat is non-competitive (D+20.)
Something, something; the devil you know is better than the one you don't know., etc.
I think in her case it was a little more than cordial