As a showcase that the Intelligent Devices aren't merely AIs that follow their masters' bidding, Raging Heart takes the initiative in protecting Nanoha by surrendering a Jewel Seed to Fate, whose Bardiche was at scythe form poised at Nanoha's neck.
Minor, but after Nanoha won her true battle against Fate, not only did she retrieve her in the water, she also took Bardiche too.
Chrono promising Nanoha that he'll do his best to see that Fate isn't punished for what Precia forced her to do. Becomes even more Heartwarming in Hindsight since Fate becomes his little sister at the end of A's.
Likewise, Lindy offering to adopt Fate in the third Sound Stage.
The final Sound Stage might as well be called "How happy can we make Fate?", with Lindy offering to adopt her, everyone throwing a party to celebrate her familiar contract with Arf, and the Loophole Abuse so she could have a talk with Nanoha. She ends up breaking down in Tears of Joy when she tries to express her thanks.
During the credits, Fate is shown having dinner with Arf, Chrono, and Lindy. It's probably the first time that she ever experienced what it's like to have a real family.