I don't think she's ever explicitly said:
"I wrote it for my dad."

But I think the only cases where she's said why she's written certain songs were: HONEY, girlish [for fans..?] and Who.. for her grandma..

i think she wrote memorial address ABOUT her dad, not FOR her dad.

I really hope the hidden tack will be a rockish ballad. Something like Memorial Address perhaps.. yeah.. something like Memorial Address would be awesome. A song that is JUST as good; like equally great... wouldn't that be nice? I hope the hidden tack will fit that style xD