The little business she started by herself has now become a 'mammoth' [='giant'] in the industry.
Renovating the house is a 'mammoth' undertaking.
a 'mammoth' [='huge, gigantic'] building
(..) The whole South thing is way out. The heat, the crowd. This great. You and me, two guys knocking about in the wild. No, you just want a bodyguard so you don't become somebody's side dish. You're very strut mammoth. Can you lead the way, Mr. Big Guy? Manfred. Stop following me. (..)2002 Ice Age
(..) He said something about being on a verge of a revolutionary breakthrough. Really? I'm flying! Some breakthrough. Look out! A mammoth is on its way. Hey, do the world a favour! Move your issue off the road! If my trunk was that small , I wouldn't draw attention to myself, pal . Give me a break. (..)2002 Ice Age