there could be, an attempt I guess. There is a SailfishOS x86_64 build, but it has some limitations.
I’ll admit I was very tempted to try this for an x86 tablet.
Though if she’s interested in Linux General, not specific to phones, I’m sure you probably recommended some Desktop OSes, but I’d have the audacity to say, maybe anything Gnome (vs Phosh) or maybe KDE Plasma (vs Plasma Mobile), and maaybe Ubuntu’s layout (vs Lomiri / Ubuntu Touch) as these can give some resemblance to their mobile counterparts.