Anne Bruner as Alice
This picks up on the same night as the original, as Laurie Strode is hospitalized with psychiatrist Dr. Loomis close at hand. The shape, as you suspected is alive and well, and shambling through the hospital to get poor Laurie who soon learns she is Michael Myers' sister. A hypodermic needle thrust into an eyeball, slashed throats and a head dipped into scalding water are among the sights as Michael continues his rampage to find Laurie.
Man, Woman and Child (1983) .... TWA Stewardess #1
Halloween II (1981) .... Alice
... aka Halloween II: The Nightmare Isn't Over! (1981) (USA: video box title)