Thta was not a cover. Shirley sang "Say You Love Me, " several years before Fleetwood Mac did.
Yes it was a cover, from wikipedia;
'
"
Say You Love Me" is a song written by singer/songwriter
Christine McVie for
Fleetwood Mac's 1975
self-titled album. The song peaked at No. 11 on the
Billboard Hot 100 for three weeks, and remains one of the band's most recognizable songs. Its success helped the group's eponymous 1975 album sell over eight million copies worldwide.
In the UK, "Say You Love Me" was the fourth single from the
Fleetwood Mac album, but the first to chart, peaking at No. 40 on the
UK Singles Chart in September 1976. In Canada,
Shirley Eikhard covered "Say You Love Me" and released it as a single several weeks in advance of Fleetwood Mac in early June 1976. Eikhard's version became a Canadian top 40, peaking at No. 34; Fleetwood Mac's version, released only a few weeks later, peaked at No. 29 in September.'