Smile Witches? Every time I find a doujinshi it's a hentai, please tell me this one isn't.
And the translation goes something like this
Erica: Trude look look! There's a bunch of sweets! Gertrud: I told you I'm not going to buy any Erica: Wah! But you promised! Sweets! Sweets! Sweets! Gertrud: Whoa! You're being annoying! And I never promised that!
Good Grief! ミーナさえ いたら (Not sure about these last two lines)
Good grief... If Minna were here...Gah--! You're being annoying! And I didn't promise that!Look, look, Trude! There are so many sweets!......Just so you know, I'm not buying you any.No way! You promised me you would!UWAAAAAAH!!SWEETS SWEETS SWEETS!