Queen Paola retreated from public ceremonies when her husband abdicated. Since she has loaned her main tiara twice: once for the wedding of her oldest grandson and once to her daughter. I don't see why she would change that behavior. You are talking of beloved grandchildren. Im not sure the relationship between Albert II and Paola and the children oof the current Royal Couple are that warm. To be honest I fear the closest relationship Albert II and Paola have with their grandchildren is with those of Princess Astrid.