How very odd....my 71 Yr old husband was told, just this week, that he has stage 3 CKD - by the pharmacist at our surgery who had called him to discuss statins! Apparently he's has raised creatinine levels in his blood since 2017 but has not been told about this in the past!
Back in Nov he was referred to ENT for an ear problem and we noticed the reference to CKD stage 3 in a list of medical history but we confidently told the consultant that this was a mistake!!
Hubby has high blood pressure which is controlled by medication and borderline high cholesterol, so I think it's these combined with the CKD that led the GP Surgery to suggest, via a call with the pharmacist, statins. We've done a lot of reading in the last few days and, maybe naively, have decided it's something to be aware of but not to worry about.
I'm sure your Mum will be fine and, hopefully, you'll be reassured by what her GP tells her. I suspect it's a pretty common thing that sounds worse than it actually is for most people and that as medical science provides more info more people will be diagnosed and offered appropriate drugs.
I'll be interested to hear what her GP says, if you wouldn't mind letting us know.
Susie