noother, a maxed Shield absorbs 1450 damage every 7 seconds, which means a 200 damage per second absorption for 120 mana per second. If you did not deal out more than 200dps with your 2 Demigods' autoattack alone, you did something very wrong in this game. And I'm not even talking about the instant damage you could have done with Pounce+Pentinence (1000+800) and spirit damage.
I'm saying this because I know for a fact that a single Minion Erebus (with Bite) at same level can take down a maxed Shield in less than 3 seconds, leaving her vulnerable for more than 4 seconds before she can "spam" the next Shield.
If you made her retreat every time you got near her, but think it's so unfair that she survived by using up all her mana when retreating the short distance home in Prison, think about it again.
And please, play her just once before judging.