You can watch the film online, thanks to Internet Archive:
DVDTalk advises being particular about the copy you watch, saying,
Fairly unwatchable pan-scanned copies have been floating around ever since the Sinister Cinema VHS days, but in this intact, restored Cromoscope version, the show comes across as an accomplished low budget effort.
Slant Magazine opens its review with this:
ikely to draw more attention as an auteurist's footnote than a mutually exclusive spookfest, The She-Beast will primarily be remembered as the inchoate, if crudely artful, feature-length debut of British l'enfant terrible Michael Reeves.