joyful like mary and pot mentioned above, they use the "reverse timelines" as a shorthand to describe it when that isn't 100% the case. it's more jumbled than that. if you try and fit it into an exact reverse order then it is more confusing imho. as to exactly why her timeline is a muddle - well, because moffatt wants it that way, i guess!
one good point though - a lot of people drew parallels between the river/doctor relationship and the book, the time traveller's wife
at least we are spared the possibilty of the 1000 year old doctor perving over the teenage river as she is growing up, thank goodness...
of course, this story line does not completely rule out any timey-wimey babies. that's one way to relaunch the timelords....