Request name for childhood movie

I am trying to identify a movie I watched in the 70’s. I recall the one actress (possible lead) as a young girl with beautiful blonde hair.  The story revolved around her being part of or in a circus yet there where adventures going on.  It was a colorful movie and I recall circus ponies. The one part was when the kids jumped into a kind of rowing boat but the boat grew arms and tried to pin the kids down. I am sure all worked out in the end but I would truly appreciate your help to identify the movie.  Thanks.

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