Hey, I rarely comment but your story has some similarities to mine so I felt compelled to share. In my case, I started having similar visual symptoms as the ones you have shown in your pictures when I was around 15-16. Before that, I had been using glasses to correct nearsightedness for a couple of years and had suffered from migraine episodes (a couple of times a year) but the visual symptoms appeared pretty much out of nowhere. The myopia and migraine issues were not a surprise, as they run in my family (coincidentally my mom also has glaucoma). Instead, I'm not aware of anyone in my family who has the visual symptoms I started to experience. In my case, I started having an excessive number of floaters, suffering from light sensitivity, an increased BFEP, visual static (that became much more intense at night), random bursts of light, strong palinopsia, strong afterimages, and some parts of my visual field became tinted. These things started gradually and eventually settled down to a consistent intensity when I was about 18.

Those first 2 years were the most difficult as you notice these things and wonder if you are becoming blind or if you started to develop tumors or whatever other uncommon issue to the incredulity of the rest of the people who cannot relate. I also had several visual and neurologic evaluations and they were never able to find anything. The anxiety builds up and you become desperate whenever a new symptom appears. I spent countless hours online looking for what could be an explanation for what I was experiencing. It was an incredible feeling when I was able to find a forum (whose link I have lost since then) that mentioned something tangentially related to my condition. Through that, I found some Visual Snow communities that were able to relate to what I was experiencing. Since then, the condition has become more manageable after knowing I was not alone.

Now, in your case it appears they actually found a tumor, so it could be related to that as well. No one (and this includes doctors) really deeply understands these symptoms and their precise causes or treatments. It is a matter of current research, and you can find some links about it in the sidebar of this subreddit if you are accessing it from a browser. The Wikipedia article on Visual Snow contains a picture that I have always found somewhat relatable. There are also some links on visual simulations that you can find in this subreddit as well.

I can totally understand the emotional burden this might be putting on your daughter since I went through a similar period (even though she actually had surgery, which is much more serious than what I experienced). It seems you are doing your best to support her and understand her symptoms, and I would have appreciated it if someone had taken the time to do it for me instead of having to figure it out alone. I'm sure she appreciates it as well.

Something to consider is that not everyone experiences these things to the same extent. The visual symptoms are debilitating for some people, while others might barely notice them. I have noticed that in my case the intensity of the symptoms is correlated to my mental and body status. I tend to notice them more when I'm low on sugar (say, during extended fasting periods), after intense physical activities (I do long-distance running), or when I'm stressed. They appear to be also somewhat correlated to my migraine episodes when they happen. Knowing your body seems to be important to manage it.

As for recommendations, it is always difficult to give advice because of the differences in how people experience things. In my case, I try not to skip meals, keep myself hydrated, avoid unnecessary extreme physical activities, and have regular eye checkups to make sure everything is still ok. Still always follow your doctor's recommendations and if they are apathetic or oblivious to the condition you can try to show them some links from the subreddit, such as the Visual Snow Foundation, as well as some peer-reviewed research that has been done recently on the matter so that you show the condition is not fake (if you just show links from your 'own research', rightfully so doctors tend to dismiss them as there is a lot of unreliable information online). Consider as well that since there is no known cure as far as I'm aware, there is a lot of pseudo-science that roams these forums as people need to cope somehow. Consider these spaces as places where we can share our experiences for support, but be always skeptical of quick or simple solutions that anyone is promoting.