Better than expected for 4 and 6 year old girls
I am a conservative movie rater and am very careful what the kids watch and the themes they are exposed to, and I would be happy for them to watch this again. (I've avoided Barbie to date, to be honest).
I have to say that this movie was better than expected, with appropriate language, strong family ties, respectful relationships and a theme of working together to help others out. The girls and women portrayed are bright and energetic and certainly brave.
The cons are there is very limited racial representation and no realistic body shape portrayals. Ken is the only male central to the story and he is the only one 'studying' but Barbie is the mastermind of the plan to save the dolphins.
The is certainly some suspense, when the 'mean' woman (Marlo) is threatening to take the dolphins away, and she speaks unkindly to others. But those are relatively mild and there is no violence, per se. One of the dolphins is captured at the start of the movie, and although my sensitive kids were worried about what might happen,it wasn't distressing for them.