Why do you think Mommy can do it? Whom are you asking?
Don't ask me! I can't make it! Ask Daddy when he gets home.
Whom are you asking? Me? No way! I'm not good at it!
直訳するなら
Why do you think Mommy can do it? Whom are you asking?
なぜママができるなんて思うの? 誰に聞いてるの?
となります。
状況から考えて、他の言い方もオススメしておきます。
Don't ask me! I can't make it! Ask Daddy when he gets home.
私に聞かないで!私は作れないよ!パパが帰ってきたらお願いしてよ。
Whom are you asking? Me? No way! I'm not good at it!
誰に言ってるの? 私? 嫌だよ!私は得意じゃないの!