Since it's atypical glandular (AG) versus atypical squamous (AS) I would think the next step would be a colposcopy to get a better look and get a biopsy. As far as the likelihood that it is cancer or has a high risk of becoming cancer, I don't have any info on that. Hopefully, it is nothing serious and/or is easily treated. Please post back when you know more. Sending cyber hugs.
I forgot to mention that vaginal atrophy that is common after menopause (and even more common for women who have had a hysterectomy) can cause abnormal pap smears and colposcopies. Of course, with your history of cancer this could be more concerning; however, that is not a given. Using a vaginal estrogen for a short period of time to heal the tissues and re-doing the pap smear and/or colposcopy can elucidate whether it's precancer or cancer or just atrophy. If you google something like "differentiating vaginal atrophy as the cause of cervical dysplasia" you will get some results... specifically, a couple of PDF documents that are helpful. Hope this helps!
Glad to hear that it is likely nothing of concern.