Well, yes and no. I mean, since the field changed, she can call off her attack, or she can continue, destroy it, take the damage, and then summon a lvl 4 or lower HERO from her deck and attack directly again, or call off the attack, activate an MST, then attack with Dian directly. OR she can kill Zoma, take the damage, summon the HERO, have it attack, and if she has another Mask Change, use it and finish Zames off. She does have options.