Six months after mediation, my ex buys a house. I believe she has been hiding money. I can't afford to buy a house. She says she isn't earning much money. She does have a new partner which she denies having. We had a small warehouse that has been sold and the property settlement proceeds were to be split 52% for me and 48% for her, as I am looking after my daughter. My question is can I ask her for more money after we settled at mediation?