OKay so the ideas I had for how they could possibly meet up with their daughter again are:
1. Something happens where they(hiccup, castiel, toothless, aurora, and blizzard) get captured(maybe on purpose as part of a plan to free the dragons that are being held captive by this village Drago's son is in charge of) and they see her there. Maybe even in their escape with the dragons they 'kidnap' her and bring her back to Berk?
2. Basically the daughter would be unhappy with her life in that village and finally gets the idea that she will go on a trip, just to see the world outside of her village for a few days. But she knows she cant do it on foot because they would catch her and brig her back before she got too far. So, she decides to make an attempt in flying a dragon out. So, she goes down to where all the dragons they have captive are held and as she's walking around, trying to decide what dragon she might take for the trip, Blizzard sees her and immediately recognizes her. My idea for this is that maybe he would transform into his human for and make a deal with her(not telling her that he knows her) and the deal is that he will take her on this trip of hers away from this village, if she lets him go free after. She agrees under the conditions that he has to keep her away from any of her 'father's(Drago's son) enemy tribes as well, fearing a sudden attack if they saw her and they are able to sneak out without much of a problem. Then Blizzard of course technically goes back on his part of the deal and much to her fear and dismay, brings her right to Berk.

We can discuses it and grow these idea more. I'm kind of leaning toward number two though. What do you think?