Despite constantly saying and doing the opposite. That's not being consistent to her character if you have to make up some weird random plot twist to justify this.
she is trying to emulate the good parts of Rheagar rather than the bad parts of Aerys and Viserys, but then throw it all away in 2 episodes.
And again, she is literally talking like Viserys at some point. You can't put much more foreshadow there without it being too painfully obvious.
And yet she does not crazy things because there is a reason for that and because a descent into madness would need to be slow and deliberate, which is something that the TV show doesn't have time for.
Aerys was a good person and later he became crazy. Viserys was crazy since his early years.