This is a story about a talented, ambitious, and highly defended young woman struggling with her humanity and struggling with whether to let others breach her walls. As those walls begin to crumble, so does she.
Let's dispense with the absurd notion that this is a "lesbian" film. Sure, Lola is in a same-sex relationship. But that no more makes this a lesbian film than her being in a business consulting job makes it a business consulting film. There's no indication whether she identifies as lesbian, or bi, or whatever. It doesn't matter. This is a film about being a human being.
I was pleased to see that Valerie Pachner won the German best actress award for this film. She was terrific.
As a viewer, I was left with the same uncertainty about what was really going on that Lola experienced. This diminished only a little on the second watching. I thought that was kind of cool.
Disclaimer: my opinions are backed up by zero expertise in Film as an art form, and far less than the average layperson's knowledge of movies in general.