Wtf is that logic.

Her granddaughters are betrothed, so law and faith bound them to to Rhaenyras boys, meaning they couldn’t escape their fate with them?

Rhaenyra is literally, by law and faith, the Queen of the seven Kingdoms. And people here and there are just ignoring that.

Rhaenys did what was best for her house and family. If Corlys had decided to side with the Greens, Baela and Rhaena would just not be married to Jace and Luke anymore.