A princess who kills an important general to rescue another girl must hope her former enemies will accept her after her escape, now wanted dead or alive.

Consider the following:
A princess in what land? A worldbuilder can help the reader envision your premise.
Can “an important general” be the captain of the guards or royal castle guards – you get the idea.
Who is this girl? E.g., a wrongfully accused servant.
What is their quest that lands them in a rival kingdom?

Hope you find this constructive, take care.