I don't think there's much to be gained by sticking to some kind of rules about when to talk and where.
It's sets you up for this kind of thing.
Now's she going to be pissed at you either way. Because it was no big deal, or because you turned a kid issue into a relationship issue.
Why is now the time to hash this stuff out anyway?
You must resist the urge to "finalize" things, or "clear the air." Usually that means we want to push some kind of final answer or solution. Most issues, like this one, are cleared up simply by saying no when her request doesn't fit your plans.
Think about this.
Blessings,
Bill
"Don't tell me the sky is the limit when there are footprints on the moon."