First of all, congrats on dating your BTGGF! As someone with some BTGGF (more like STGGF) insight, I think you have a lot of good avenues to explore with the occultish stuff. Look on metaphysical shop websites for ideas. I personally would love a good pentagram necklace, or maybe something with a baphomet. Crystal jewelry is also a good bet. There are a ton of different crystals with different meanings, so perhaps google some shit and see what resonates most with her. If incense and other burnable shit is up her alley, look into a nice incense burner, candle holder, and ofc, incense and candles. If you happen to live near a metaphysical shop, stop in and ask the shop owner for some advice. They'll probably hook you up with some neat shit.
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Idk about who she is exactly, but there are like, cat stockings on the market that are cute and gothy. Honestly, stockings of any variety would seem pretty tight *badum tish*. I'm biased, but I think funky little socks would make a wonderful gift.
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And of course, MAKE her a cute card. Maybe put some pressed flowers in it? OOH you could get her a journal/book of shadows with a flower pressed into the front cover or something.
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Best of luck!
Cute ^_^ the cat thigh highs would go great with that outfit too
https://www.amazon.com/Rbenxia-Kitten-Length-Tattoo-Pantyhose/dp/B00JL9ESU4
I got mine at Hot Topic, but they sell the on Amazon too, here ya go! https://www.amazon.com/dp/B00JL9ESU4/ref=cm_sw_r_cp_apa_i_qUoRDbNCVBPN6
Here you go pal ♡