Now this in my opinion ok.. No judgement

When I quit work when DS was 11 months old we made the decision that I would be a SAHM till the last of our children went to school. We did try DS2 in daycare the year before prep. (half days once a week) Him and I were miserable,,

None of my children (apart from Ds1 when I was working) went to daycare (should point out I worked in daycare so my son was with me most days) They are quite social, and generally make friends with other kids quite well.. They all play well together

If your gut feeling says to keep her home then do so. I don't think you can "damage" them either way to be honest..