Any female character that is being forced to marry into a pureblood family should look for Owen, who is wife hunting. He's a gay 19 year old male who needs to find a wife to hide his sexuality and fill his want of children. The child doesn't have to be concieved. They can adopt, as I'm sure that Owen would be repulsed by the thought of "relations" with his beard-wife.
Post here with your ideas and PM me if you have questions! Thank you!