Well again, she allegedly cowrote half the songs on "Ram"
Posted by Pugeye on March 22, 2018, 12:21 pm, in reply to "Linda McCartney's sole contribution to Wings as a singer/songwriter"
and apparently had to prove her musical abilities in court because I guess someone thought Paul just put her name on his own songs to somehow get double royalties (not sure how that works but remember reading something about that). So if that's to be believed, I'd say she has more musical talent than Yoko just based on that. But aside from that album, my assumption was that Linda just played keyboards and sang backup.