LogFAQs > #907386791

I don't think you have to get her to third ascension to max her out, that's just for some other rewards. Looks like the most difficult one might be "Clear 90 Missions" (there are 100 I think). It'll depend on if you get some good Supports and figure out how to use them effectively.

There's a document in the first post that has our friend codes. I especially recommend friending Lopen since he'll probably get Ilya, and Saphir since he has Medb, and those'll be the two most useful Servants this event (though lots of others will be useful too. Different Servants are useful on every node!).
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All the stars in the sky are waiting for you.