The Alpha Broodmother is one of the easiest bosses in Ark. For a smooth and simple defeat of this boss, I reccomend an army of 17 to 19 Deinosuchus, with atleast 35k health and 900% Melee, then 1 Yutyrannus. Daedon are optional, but if needed get 1 or 2 of those. It is very likely the boss will be shredded even without the Yury and Daedon abilities, but with them, the boss is absolute fodder. Hope this helps.