She was the lead singer of Scottish band Stone the Crows.
The band was founded by Les Harvey {brother of Alex Harvey}.
She has been described as 'the Scottish / British Janis Joplin', because of her vocal style.
She is probably best known here in Britain for singing 'No Mean City', the theme song to our longest-running TV detective series "Taggart" {she also appeared in an episode "Evil Eye", playing a gypsy}.
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HeresyIsLovely :
Actually, Maggie Bell has never worked with Mike Oldfield.
You're thinking of the other Scots singer Maggie Reilly, who sang a majority of his songs from 1980+, most notably 'Moonlight Shadow' and 'Family Man'.
As far as I'm aware, she hasn't worked with Pink Floyd either, and the singer with Roger waters was Madeline Bell...