Okay but why go back in after you already eliminated one dragon and could have possibly escaped?
That really irked me. Seemed like a bit lazy writing. Was just getting on her man for almost dying fighting and then just goes and does that the same episode.
Assuming aegon is just a burn victim now that will only be able to sit there and do nothing like Alicent had wished he would do.
I mean its pretty straightforward... If they successfully defeat Vhagar, that would essentially end the war entirely before it even really begins.
Sure it was basically a suicide mission, but Rhaenys has been the one this entire time petitioning to avoid the conflict, she knows how much blood will be spilt in the war, she's even the one who says the hard hitting line of the series so far about there being no war so cruel as a war between kin.
If I'm not mistaken, at the start of the dance, the greens only have three dragons. Vhagar with Aemon, Sunfyre with Aegon, and Dreamfyre with Helaena. If Rhaenys eliminates two of them in the very first battle, including Vhagar in particular, that's it for the Greens. They're toast.
She saw an opportunity to basically end the war before it truly even begins, and she went for it.