While obsessiveness and compulsiveness are obvious I also detect a problem with cause/effect and responsibility. There seems to be missing that 'hesitation factor' that most people have that causes us to stop and momentarily weigh out the pros and cons of a decision. Thus her impulsivity goes unchecked. Has she gotten into trouble with authority or authorities? How stable is her employment? Is she best in a structured environment?

Netherlands, eh? I am assuming then you have public health care accessible. I actually would start with your family doctor. They can assess the situation and point you in the appropriate direction with a referral. Hopefully this includes a psychiatric assessment.

Ultimately you may have to let her fall without stepping in. She needs to realise there are consequences for her choices. But be there to pick her up again so she is aware she has some support. I know this is hard to do as it is instinctual for us mothers to dive in and try to protect our children from harms way but in this case standing back may actually be the best thing for her.