Yes, but she can't be stronger than Lanji, let alone Zoro or Luffy. The monster trio has been maintained by Oda since chapter 60 or something. There is no way Yamato gonna fuck the balance and be stronger than them. Take it as a fact.
Look at Jinbei! He's fighting Who's Who. Look at Franky after Enies Lobby, Brook, and Robin after they joined.