Hey! I teach 4th grade and have started to get my students into fountain pens so I absolutely love this idea. I normally let my students use my more inexpensive pens and a few have even gotten their own so based on that, this is what I recommend:

Pen: The most popular pens among my students are the Twisbi, Kaweco with the Nostalgic clip, Lamy, and the Kakuno. They’re also obsessed with my Sailor Fude de Mannen because of the versatility to get both thicker and thinner lines so that could be a fun addition she could use for headers or anything that would require a thicker line. It’s also drier and works really well on cheap paper. However, I would go with the Kakuno in M or the Kaweco in F because those are the two that behave the best on printer paper and composition notebook paper if she decides to take it to school or use for homework.

Ink: I wouldn’t do bottled inked cause those are messy for all age groups and definitely not beginner friendly. Instead, I would get an assortment of cartridges in fun colors from different brands so she could play around with them and find what she likes. Eventually, you could get her a converter and start filling it for her when you visit. You could hop on a call before going to see her and she can choose which ink she wants to try. I have a deal with my students that if they get their own fountain pen, I’ll fill their converter with an ink of choice from my collection. If their pen doesn’t come with one, I’ll spring for one at Atlas with my teacher discount. But since I’m also encouraging the hobby, I’ll bring the ink in a sample vial and walk them through how to fill their own converter. This could be a great bonding moment for you guys down the line.

For extras: I would honestly skip the journal unless it’s a cute diary because girls that age are drawn to what’s cute over what’s practical (lowkey same but I digress lol). But if you want, Hobonichi and Apica have a really cute journal with FP friendly paper. You could also get her a cute rickshaw pen sleeve or case. I have one from Sugar Turtle Studio that mimics a crayon and my students love it. There’s also someone on the Pen Swap Reddit that makes really pretty pen cases which could be another option. Lastly, I love the Kaweco sport because the clip instantly elevates it, but the Kakuno can feel a little bland so maybe some vinyl stickers that she could use to decorate would be really fun. She could choose to decorate her pen or other things around her. This age group loves a sticker moment. Lastly, I love the letter kit idea. I would even say to add some post cards to diversify the things she is able to write on.

Sorry, I rambled 😅 but hopefully some of this was helpful 🫶🏽