Reginald MacSomerled and Helen de L'Isle

Hello

I am trying to verify some conflicting information I have on the
parentage of Helen de L'Isle (1174-1212). She married Alan of Galloway
(1175-1234). Most reputable sources say that her parentage is
unknown but I have found one source saying that she was the daughter
of Reginald MacSomerled (acknowledged son of Somerled) and his wife
Fonia Moray.

Any ideas would be appreciated.

Isabel Darcy
.