I’m far from an ABBA enthusiast, so don’t shoot me down 
But isn’t the ‘Frida’ page used for her solo (band) projects / albums outside of ABBA?
It’s a tricky one, for many artists it’s quite useful to have their various pseudonyms kept slightly separate. Especially if they’ve worked on a range of different musical styles / projects over the years under different monikers.
You can always merge them together in your own library.
That said, as the very least I suspect it would be helpful for both her pages to have an “Also known as” link on them like so:
