CMLeidi: If you are thinking Murphy had control over what was told the public and when think again.
When Lane was having throat problems in the Producers, there was a HUGE discussion among the creative team and the producers and Lane etc...and there was an agree upon position.
The producers in most cases like this don't like to replace the person unless it is absolutely necessary or if they have someone who is perfect and of good star quality waiting in the wings. Otherwise, they'd rather keep the audience guessing so that they show up for the show thinking they MIGHT see the star, since the star has been in and out.
In a case where a star is seriously ill it can be devastating to do this, but they are under contract and will typically TRY to keep going if they are pros because (contrary to the opinions of SOME) they are PROS and want to fulfill their obligation.
Is this right for the audience OR the star? No...probably not...but this business exists to make money and that is the primary objective. NOT to be 'fair' to an audience member or to give the star time to recuperate.
This is a grueling business and professionals are expected to give it their best shot. Some do...some don't. I think Murphy has tried her best and I hope that whatever is ailing her will be resolved after she is out of the show and able to rest.
"Life is a lesson in humility"