Thank you for your interest, Jane! You can donate here: http://simn-global.org/donate/ → Add a note that it is for Cucuta and 100% of the funds will reach the Scalabrini Centro de Migraciones.
It is a mix of factors playing into each other. It mostly comes down to changing funding modalities, namely by the EU. The funding modalities are driven by underlying political decisions. The official argument is that compared to 2015/16 fewer people on the move are entering Greece.