Well, I think you already know Negan would value her on his side. There is constant need for a messenger between the Saviors and the communities that serve them. Depending on her morals and what not (since I'm still unfamiliar with the character I'm sad to say) I could even see him appointing her to carry out his 'welcome' message to new groups they find. (which is basically killing off one of their own to make a point and to show he means business before making them work for the saviors) Though if she isn't comfortable with that, I'm sure there are other (slightly less violent) messages to be delivered. ;)