I don't recall seeing this. When did Teresa battle a Abyssal One? Unless your refferring to the former number 1 before Teresa then I want to say that she looked more or less an average awakened being to me. Its unclear how they categorize awakened beings and abyssal ones but generally I'd imagine they have to be as strong as Teresa or have about as much potential as Priscilla in order to become an Abyssal One. Rosemary just didn't appear like one. I'd say if I have to compare her I'd compare her with the level of Duph or maybe Rigald in their respective Awakened form being Ex-number 2 and 3's.
Teresa was the supreme claymore... probably the strongest one ever. She took down an Abyssal-level Awakened after letting herself go ragdoll for a few shots.