1. ldshousing.net it usually has a good amount of places available
2. There are so many lds housing Facebook groups available for Arizona it’s become tricky, but I think I am on five of them and usually posting on all of them that you are looking might help.
3. The asu and mcc institute usually have places to post and search for housing
4. You can try the ward housing specialist where she will be moving. Most singles wards have this for a calling
Hope this helps!