Normally she wouldn't have been snippy about Billy's reservations at all: she understood why he would be feeling that way about Ronnae and what losing her would do to him. but after what happened with Aang, making the best of what you had was important, and she wanted Billy to be happy.

And if SHE had any say in the matter, she would make sure that Billy would be with Ronnae, no matter what happened. They needed each other, and honestly, she cared a lot about both of them.

She gave him a similar bow. "I'd say the same for you: I heard Ronnae and Billy mention you before. I'm glad to have met you, and I hope I see you again in the future."