Hobbies are by their nature personal endeavors. While it's amazing if someone also finds it appealing, the most that one should hope for is that the other person respects, admires and encourages the personal pursuit.
Of course, the most anyone can really count on is a muted tolerance. (Less than that doesn't bode well.)
IMO, you are doing well by supporting her attempt at sharing your interest. Bravo and keep it up. Just be sure to show her tank at least if not more obvious care and attention, and don't be disappointed if this is as far as she goes. She may even lose interest one day, but will remember that the door is open if she wants to try again.
And don't forget to reciprocate.