Atlas–Styloid Narrowing with Severe Swallowing & Digestive Symptoms – Could This Be Vascular Eagle Syndrome

I’m glad that you were able to attach the images of your Mum’s scans, I agree with the others that her IJV compression is severe, so no wonder she’s been feeling very ill!
Dr. Kamran Aghayev has done surgeries for members including C1 shaves, so good you’re considering consulting with him. You can look up discussions about him using the search function on the site , there’s some info in this discussion to get you started:
A Canadian’s Journey: VES Surgery in Türkiye Dec. 10 - General - Living with Eagle

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