Meta Software Developer interview questions

I applied online and within a few days received a request to choose a date for a 45min technical interview. They sent me a link of the "collabedit" I think - to familiarize myself with it. Once I got on the phone with the interviewer, she send me the link and she had already typed the problem that I had to solve. The problem statement was unclear, when I asked questions she could not explain well what she wanted, there was a lot of disturbance on the phone - so I offered to start writing some code but she would not let me write till I came up with some idea of how I would proceed with the data structure she had in mind. Unfortunately, we spent 40 minutes just talking and brainstorming and then finally in the last 5 minutes she said I could start coding. I quickly wrote some working code, but ofcourse 5 minutes is just not enough. Overall, I think they should have a timed online code assessment where these all issues don't come in the way.