It's possible that:
* They are a newer actor or actress: Their career may be just starting, and they haven't yet gained significant recognition.
* They use a different name professionally: They may have worked under a different name or pseudonym.
* The information is not public: Their projects might be private or not widely released.
To find more information, you could try:
* Searching online databases: IMDb, The Movie Database (TMDb), or other similar resources.
* Checking their social media: If they have a presence on social media, they may share information about their work.
* Using a search engine: Search using their full name and "actor" or "actress" to see if any results appear.
However, without more specific details, it is difficult to provide any definitive information about Mattie Fitzgerald's acting career.