During that same year, she became a World Champion – bringing a gold medal to her team, competing at a Team World Championship.
In 2016, Marianna continued her depth progression, focusing on the specialty of constant weight and reached -93 meters, taking bronze medal at Vertical Blue and 4th place in the world in that discipline. She also brought a bronze medal to her team during the Team World Championship.
During Sabang International Freediving Competition in 2018, she obtained gold medals in all three depth disciplines and won the overall competition. The combination of her depth results placed her #5 deepest diver in the Overall Depth AIDA World Ranking that year.
In 2019, Marianna competed for the first time in constant weight bi-fins discipline. Diving to -85 meters, she not only established a new national record, but also positioned herself #2 in the AIDA World Ranking.
That same year, during the Individual Depth World Championship in Villefranche-sur-Mer, Marianna won the title of World Champion in free immersion, two silver medals in constant weight with monofin and without fins and has been awarded with the Molchanova prize as the best athlete of the World Championship.