regressionconfession, the thing is that play-based need not imply 'lack of structure'. Indeed one school I saw was highly structured in reception, but that was also the school in which play-based, child-led learning continued through Y1 and into Y2.
In our school, at the time when DS was in reception, there happened to be a lack of structure in YR. Your school could be completely different. As is ours, now, with a new teacher who changed a lot of things, incl. introducing a lot more structure (whilst keeping the play-based learning and actually urging the Y1 teacher to introduce more of that).
Also all children and what suits them are different.
And whilst DS thrived in Y1, I saw other children who really struggled.
So don't base your decision on what other people with different children at different schools experienced. Just maybe add how structured YR/Y1 are at your school into your considerations. If you feel your DD could do with another year of YR, is that because you feel she basically was 'too young' to get anything out of it, first time round, and is now 'ready', so should start again? That might still be entirely correct, and sending her into Y1 (which, at your school, might be all spelling tests and work sheets) might not give her that desired structure, but instead simply put her off school altogether. Your Y1 may in fact have less structure and more unwritten rules than your YR, for all I know.