I totally agree with the others, a half day sounds brilliant! What I'd give for a full day but I also remember being very hesitant leaving DD1 despite her weaning at 11 months and being a very independent little girl. I just wasn't ready and when we both were, I gladly handed her over. DD2, my velcro baby, well she's a whole different story Lol.

You don't need to justify your actions at all. Simply say a half day spa treat would be brilliant. I hope you get to enjoy it!