あなたにあげるものがあるの!
I got something for you!

 何?!
What is it?!

 当ててごらん! あなたがずっと欲しがってたものよ。
Take a guess! It's something you've been wanting.

 ミニカー?
Hot Wheels?

 当たり! はい、どうぞ。昨日、頑張ってママのお掃除手伝ってくれたでしょ。だからこれはありがとうの気持ち。
That's right! Here you go. You did a wonderful job helping me clean up the house yesterday, so this is a thank you gift from me. / This is a token of my gratitude.