@Shellymo - Welcome to our forum! I’m sorry for the struggles your daughter has had & continues having. You posted a couple of good images of the styloids, but the compression of your daughter’s IJVs isn’t obvious to me in either image. I’m sorry to say that I’m not good at finding the best images in the dicom library links so will hope that someone else can offer an opinion.
Your daughter’s styloids are definitely long & pretty thick up at the top end which might explain why they’re causing IJV compression. I’ve annotated your two pictures & attached them below. I also noticed that the right & left styloids are putting a little pressure on her external carotid artery. I’ve circled the area in the last image below. Finally, she has lost the lordotic curve in her cervical spine. Many of our members have this situation, & we’ve gone the rounds w/ can a straight cervical spine cause ES or does ES cause the spine to straighten. Regardless of the answer, the cervical spine can regain it’s curve with PT & practicing good postural habits. For some members working on that process has helped relieve symptoms. There is a lot of good information on our forum on the topic of military neck & forward head posture which can both be related to poor posture. Here is a link to get you started:
The red oval by the angle of the lower jaw is where the styloid is pushing on the external carotid artery. The same situation is occurring on the left side.
This image of a proper lordotic neck curve belongs to @Henrik one of our moderators.
I hope this information is helpful. Henrik may be able to view the dicom library images & offer some other input.