you need 2 to 3 hearts of affection to get that i think 2 is a maybe i dont remembre but 3 is certain
Now that you mention it, yes, if you have 2 hearts on Dalia's character screen, you have enough to pass the threshold; if you have less, you don't. 3 is not even possible at that point as far as I know.
But beware! This is the only instance where hearts and threshold actually line up perfectly, for every other threshold you can't use hearts as a reliable indicator unfortunately.