It happens often enough that an actor or actress doesn't make a big impression early on and then a lucky break puts them in the right place at the right time and they go on to flourish.
If Majel hadn't been GR's openly known mistress one can wonder if she might have been seen differently.
But with that said the way the character of Number One was put across didn't make for an engaging presence. In general many are not drawn to or intrigued by aloof and generally expressionless characters. So to an extent Majel might have also suffered from following exactly the direction she was given for the character and the NBC execs mightn't have really grasped thats what her character was supposed to be.
If Majel hadn't been GR's openly known mistress one can wonder if she might have been seen differently.
But with that said the way the character of Number One was put across didn't make for an engaging presence. In general many are not drawn to or intrigued by aloof and generally expressionless characters. So to an extent Majel might have also suffered from following exactly the direction she was given for the character and the NBC execs mightn't have really grasped thats what her character was supposed to be.