Frost is mostly here to support her sister, being another water wolf herself. While Trident wants to go to the glacier for the ocean, Frost wants to control the ice however it works. It's sharp and cold and strong. Only the strongest things can live on the glacier, bears, walrus, whales and anything that could survive living with those beings. Frost wants to meet the Arctic wolves there.
When the next in line announced they were living in a glacier now, Frost knew Trident was the reason. It's a new era in Silverfell and Frost met the Arctic wolves. It was not the way she wanted nor expected. They were understandably upset to share limited resources with a large pack, but Silverfell wiped them out in a bloody conflict. It was less of a battle and more a mass murder. The few remaining are scared and nontalkative. Surely they will warm up over time?