I'd also suggest that suggesting a child has outgrown a dress is a comment that carries a lot less "emotional weight" than addressing a topic which could be construed as parental interference/criticism of the younger generations' parenting style. That kind of a comment can be easily misconstrued and is what I'd call "emotional dynamite.

Also, there are some parents who are more "hands on" as in emotionally demonstrative than others. She might not think she is picking her up too often.
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