Amara was running from the Mutant Response Division, which caused her powers to almost destroy a city block as part of Senator Kelly's plan to defame mutants, when she was saved by you who, for whatever reason, was not burned by her abilities. She was genuinely thankful for this, but you see something...else in the lava mutant's eyes, so you took her home.

"T-thank you...a-at least that city block is safe now"