Divorce and Children's Interest in Adult Topics Too Young

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Any bros either in psychology or who just read science about it know anything on the subject.
I have a cousin who divorced when their child was 1 and she is trying to grow up too fast and thinks about topics like relationships and even the physical aspects of that way more than any other child I've ever met.
Ofc she has no real idea about any of it.
Any knowledge about it?
I feel the need to have some reference points to keep her acting her age even though both parents have remarried for awhile now, but they have split custody.
I just want to point out things to them in literature about the situation not intervene myself although we're close enough that some vague advice may be enough.