To answer your question, she wasn't a movie star in 1949 when that famous 25th anniversary film was made by MGM. In fact, she didn't even appear in a film until the following year. What she was, however, was a promising young actress and was being groomed for movie stardom during the '50s. While that didn't work out so well, she did become a television legend (which isn't so bad, come to think of it
).
No blah, blah, blah!

For one thing, television stars tend to be local, usually known only in whatever country their shows are broadcast in, while movie stars can be internationally known.
That was certainly true during the Gunsmoke era.
In modern times TV series have become international. Hugh Laurie was unknown out of the UK until House made him a huge star. That show was very popular in many countries.
That may have started with Baywatch in 1989. David Hasselhoff was already a popular singer in Europe. Especially Germany. Baywatch became the most popular series internationally and was watched all over the world.

"I would say yes she was a star. You insinuate that television stars are not real stars."
I would say you don't quite get the concept of insinuation. But on second thought I think it's generally true that television stars are in a lesser galaxy than movie stars. For one thing, television stars tend to be local, usually known only in whatever country their shows are broadcast in, while movie stars can be internationally known. The exception would be stars who have made it big on both movies and television. As far as I can recollect, Amanda Blake was not a big movie star, certainly not in the same league with Clark Gable and some of the other stars attending that MGM shindig.

I would say yes she was a star. You insinuate that television stars are not real stars.
She was never a movie star. She was a real television star though. A wonderful actress also.
Have you ever seen The Jailer with Bette Davis?
The Jailer (1966)
Amanda Blake is as good as Bette Davis (who was a real movie star) in that episode. They were both great.