Right well this afternoon Broadway has announced that all its theatres will stay closed until 2021 (January 3rd), and I wouldn't be at all surprised to see London's West End follow suit in the next day or two with similar dates, and then the remaining UK provincial venues that haven't already announced closures of similar length, do so shortly afterwards.
I'd say Miss Fletcher's dreams of being Cinderella are in real trouble now, I really really can't see anyone working on or risking investment on any brand new shows until both Broadway and the West End are fully reopened and everyone's comfortable that they're able to make money again. And even if they do get on with Cinderella, I'd expect the whole thing from top to bottom to be reevaluated which may include recasting, and don't forget virtually every West End performer has now been released from whatever show they were contracted to, so Mr Lloyd Webber and his investors are going to have a real smorgasbord of talent available to them. Anything goes now, regardless of the fact that her name was previously connected to the show.
In the meantime if she wants to stay relevant she'd better overcome that anxiety and start doing the streamed stuff such as Leave A Light On.