Need help interpreting my eye exam results

So, my 70-year-old mom just had her eye exam, and the results were a bit heavy. The doctor noted a cup-to-disc ratio of 0.3 on the right and 0.4 on the left, along with some increased central retinal artery reflex and compression at the arteriovenous crossings. Luckily, the macula looks clear.
She’s currently on blood pressure medication, which keeps her around 150/80. Her ophthalmologist basically dropped a bombshell, telling her there's a real risk of a vessel bursting in her eye, or even worse, something happening in her brain. It honestly left us feeling pretty shaken. Does anyone know if we should be rushing her to a specialist for a second opinion, or what this actually implies for her health?
I’d really appreciate any advice you guys have because I definitely don't want to sit around waiting for something to actually "pop."

It’s not high blood pressure—it’s actually PNO, and those shifts are just what happens when the pressure spikes.

I figured I’d jump in here with a question—I couldn't find a more sensible thread, and I'm sure there are a few experts in here who actually get this stuff. 😁 (I'll write this in the first person even though it isn't about me personally, just to make the discussion flow better 😉)

"I went to the eye clinic for an exam because my last checkup was three years ago, and the results read:

OD c -0.25 DSP = -1.0 Dcyl axis 180 degrees = 1.0
OS c -0.25 DSP = -1.25 Dcyl axis 20 degrees = 1.0

Fast forward a week—I stopped by a local Visionworks to order some glasses, and since they offer free exams if you buy lenses from them, I decided to go for it. It was free, it couldn't hurt, and I assumed the results wouldn't differ much. However, the optometrist there gave me these numbers instead:

OD c -0.5 DSP = -1.25 Dcyl axis 165 degrees = 1.0
OS c -0.3 DSP = -1.75 Dcyl axis 15 degrees = 0.9

What I need to know—and please, treat me like a total novice here—is what all these digits actually signify? How much do these two sets of results truly differ, especially considering I wear glasses full-time and the gap between these two appointments was only six days?

Also, I'm curious about the relationship between Dcyl and DSP—basically, what is my actual prescription? How do you convert those into one single value?

Furthermore, can these axes shift over time? Three years ago, my axes were 180 and 20 degrees (which are the glasses I've been wearing), but now this new doctor says they've jumped to 165 and 15. The doctor wasn't helpful at all when I showed her the previous findings. 😢 She basically shut down the conversation immediately."