With them both having been raised within the Keystone pack they should have had/have some kind of solid relationship. With Westin having missed the all the fighting due to him being more concerned with getting his sister and her kids to safety(it also coming as a request from the pack alpha at the time, his sister being married to Sam.) Daci could have left her mother with the small group before she went back to claim her father's body.
Before all hell broke loose, Westin had been an easy going guy, though completely dedicated to his position as enforcer, Now he tends to be more serious then is good for him. He also regrets not having gone back to try and help with the fighting, but he also knows that if he would have he would have broken the promise made to Sam to keep the alpha's mate and children safe.
I was thinking that maybe Daci was the one who convinced Westin to lead the ragtag group that split from the Keystone pack for one reason or another.