She never auditioned for Anna or Elsa. Sam Barks was attached to that role from very, very early on and the casting breakdown for Anna was very clear about size and height, they wanted her to look very young, borderline childlike ( I know this because I saw it when it very first went out).
I would be very, very surprised if she was considered for Olaf given they wanted an almost identical replica of the film, where possible.
I bet she’s kicking herself that she’s tied in to this sh*t heap of a show and missed the boat on My Fair Lady and Waitress…
Oliver was 100% with her, initially anyway, to raise his profile. He loved the attention and perks of being with her and I would be surprised if he would have got Hans without her- he’s good but without her he was just another decent ensemble boy. But, as time went on, he realised that he’s got what he needed career wise and the next stage would be marriage, which he didn’t want. I think he waited until he had somewhere else to go, then dropped the bombshell. He is doing all the right things by keeping quiet though. If nothing else, it’s driving her completely mad.