I leave the country soon for nearly 6 months, gift ideas for my girlfriend

Hello guys,

i need help finding a gift for christmas and my departure combined.

Here some details:

• We both are students
• she is 21, im 23
• i leave for a semester abroad in Norway (we live in Germany)
• budget: 40-50€
• her hobbies: reading, photographing, videogaming
• we spend most of our quality time watching netflix together
• we are together for 2 1/2 years now
• we will be students for another few years

I would like something to give which remembers/ helps/ she can use, when she misses me. I would really like the relationship to get through this hard time and i think i good gift can be a good start to it.

I would appreciate shared ideas :)