This ones is complicated. Before the defender received the ball, the runner already started her dive because the fielder was in her way. That would be obstruction, the runner was hindered. But that still does not give the runner the right to take out the fielder. It looks like poor skills on the runner rather than straight malicious contact, but should at least get a warning on this. There are many other ways to avoid a tag or deal with obstruction than taking out the defender. You can have both obstruction and an ejection for malicious contact on the same play.