 As leader of the working group concerned with the Spanish costal law, she managed to illustrate the situation in cooperation with her colleagues from different member states in a delegation trip to Spain with representatives of the Spanish government, the local authorities, NGOs and the affected people themselves.The “working document on the deliberations of the Working Group on Spanish property rights and the 1988 Coastal Law, including a fact-finding visit to Spain, 21–22 March 2013“ shows the developments concerning the petitions focused on “Ley de Costas.”

In June 2013, Werthmann was leader of the delegation to Copenhagen, whose results were published in the “working document on the fact-finding visit to Denmark from 20th – 21st June 2013”  The goal of this fact-finding visit was to gather facts and to listen to all concerned parties, including the petitioners, about their experiences with Danish administrative, political and judicial authorities that where in charge of cases touching subjects such as children's safekeeping, custody, child care, child kidnapping.All information had been brought to the attention of the committee of petitions by (former) partners/spouses of Danish citizens and the violation of basic, human, children's and female rights can be traced back to the “Parental Responsibility Act.” These violations of rights have been experienced to 90 per cent by women and mothers of Danish descent and to 10 per cent by women, mothers as well as father of non-Danish descent.