Depends as all these calls do...
1) if the umpire believes the runner intentionally ran into the fielder then the runner is out. I have seen this too often with coaches who tell their base runners to make contact with fielders to try and get calls.
2) if the umpire believes the fielder is at fault, then the runner is protected (which is irrelevant here since she safely made third and stopped) and at the end of the play the umpire can award what ever base they feel is appropriate. If that is home, then that is home. If third - well she is already there so there is no award to make.
3) Defensive coach is at risk of being thrown out for entering field of play before the play is over. I'm probably giving some leeway as he may be worried about an injury, but if they are just coming out to yell and scream and don't handle it well, well we will see if they get to stay or not at the end.
OP said fielder is in baseline how can there be intent to run her over? If shes in the base line she is in harms way runner has the right to round the bag and advance without being obstructed. I can't believe how many times I've seen 1st base standing on the bag watching the ball go into the outfield and a batter runner has to go around the girl on 1st ...runner has the right to take a line on the inside of the bag if she get knocked down its not the runners fault .....coaches need to teach kids how to get out of the way when play is not at their base.