My daughter is desperate to go to auschwitz so that is the purpose of the break!
Have you already booked your tickets for Auschwitz? If you want a tour in English, they may well already be sold out for this October half term - they can sell out weeks in advance, especially the English speaking tours during peak times such as school holidays. It's worth checking before you book a hotel/flights, if this is the main reason for going to Krakow.
Also, please don't do what we did - we booked an organised tour through Get Your Guide - and we were let down the night before we were due to visit Auschwitz. Having read some of the comments on facebook pages, this is common with outside operators, and you should book direct with Auschwitz.
In the end, we were lucky to get a place on a tour, but in Polish, which was better than not going at all, as there was plenty to read in English, and the tour guide was kind enough to pass us on to an English speaking guide for the Birkenbau part of the tour, but this isn't something they usually do. But to get the most from your visit, especially if this is something your daughter is desperate to do, it's best to have a tour in a language that she will understand.