It's possible:
* The name is slightly misspelled: Perhaps you're thinking of a different name with a similar spelling. Could you double-check?
* She's a less known actress: There could be a Jean Allison working in smaller productions or regional theatre.
* She works in a specific genre: If she focuses on a specific genre like indie films or television commercials, her work may not be widely known.
To help me find her, could you provide any additional information you know?
* Is there a specific time period you're thinking of? (e.g., 1980s, 2000s)
* Do you remember any other details about her? (e.g., physical appearance, nationality, specific roles)
The more information you can give, the better chance I have of finding her!