Miesa needs to 'get up' even with a small step such as telling the whole truth to Eric, always accepting Prince's orders is just a mere temporary solution & even in the process could potentially kill her own husband, if she truly understands the prince then she should know that the prince only powerful inside his own royal territorial moreover that his mind isn't getting more and more unstable to accomplish scheme like he used to

*SPOILER*
Sadly, if the manga follows the ln, it would be on the very end & of course post-drama arc that pushes her to do it

I just realized that this manga is a new take on childhood friend trope, love the realism