I went out and bought distilled water today & watered her for the first time with it earlier, in hopes of that helping... my self diagnosis would be if a correct PH doesn't fix it by allowing access to nutes, then it's a phosphorus deficiency... but I don't know how to cure that...

Before I was using my tap water, but am stopping that today.

I'm looking for some other opinions on it so I don't act with the wrong treatment...