I can when I do updates to the site, however we'd need an in character post from your character Frost to be wanting to join in order to have her join the pack.
Usually when joining a pack characters have to meet and be accepted by an already established pack member. They're almost always accepted, unless there's hostility in character.
The other way would be if a character wanting to join is posted in a reply to a pack meeting, which Sabertooth does not have one at the moment.
I hope this helps, once you post Frost wanting to join I can reply with one of my characters from the pack and accept her. Then I can get Frost onto the packs page.
I also wanted to ask, did you find a Bloodline you'd like Frost to have? This way when I update the members board and put her up I can have everything up to date. <3