1. Though she is and will be entitled to maintenance u/s 125 crpc since such case is not filed as yet it is prudent to prefer an appeal.
2. You should take the plea of dissolution of marriage as ground for challenging the DV Order. Since Triple Talaq is pronounced and it has not been set aside by any civil court as yet, PWDV Act does not apply to you anymore.
3. No need for final decision. As sated above consequences of Talaq applies now in PWDV Act though it will not make any effect in 125 crpc case but as long as it is not filed take the advantage of Talaq.