Translation of mademoiselle in Spanish

It looks like we need to invite Erika again to my home, once the cake is ready. Of course, this should be done before Sunday to stay in the chocolate cake race. We should buy cream too.
I would also need to know whether pricing can be different, because otherwise that amount would be too high. Some of the translations are not accurate at all and would also need corrections so that the dictionary displays only correct words.
I was very lazy, and I've preferred conversation in German... so that is why I do not learn English anymore, I sometimes chat with friends from London. see ya soon. Anja.