i think that they could be the better half of me.

Mordecai had remained thoughtful and quiet during her speech, and so she hadn't been able to tell very well what he thought of what she was saying.  She caught the smile on his face after she stopped and she took it as a good sign.  When he spoke again, there was still some reservation in his tone.  It was hard to tell if she had him or not, but she had faith in him and that was comfort enough.

"Yes," she answered him simply.  She had already explained her need to go now - that Luke and the others were all waiting for her to give them a home.  As much as she cared for Mordecai and as huge of an undertaking she was proposing, the druid had no doubt that this was the path she needed to take right now.