How many movies have Effie Balconi and Marlene Grohn acted in together?

They have worked on 2 movies together! Their first movie together was Heidi 2: Im Wald und auf der Heidi (1990) while their highest rated movie together was Heidi 3: In der Heidi ist es doch am schönsten (1990). They have not worked together since Heidi 3: In der Heidi ist es doch am schönsten (1990).