How to fight spider mites

I live in Germany and have just looked Spinosad Is allowed, get it and then use it, thank you you have helped me a lot

I'd have to recommend something with spinosad. But your window of time left to use such a product is dwindling. I'd use it like now so u can still have time to do 2 more applications 4 days apart. And still be within the 3 week of flower limit.

What would you use or suggest to me what to use?

As ur just barely starting to flower.. Now is your time to be as aggressive as possible. As u get deeper into flower ur options really deplete to basically no options at all. I'd try something more species specific. But no harm in using that now if that's what u choose... it's just a case of effectiveness.

She hangs on the window and the window is always open so to speak it is outside, I read on the internet that I can mix 4 parts water with 1 part rapeseed oil and can spray it 1 a week, but not in the flower. Can I still do it if I covered the flowers and just spray the leaves with them?

Also note the mineral and element values of what ever u choose. Alot of pesticide contains nitrogen content. That encouple with regular feeding and it can lead to nitrogen toxicity. Or some other toxicity depending on the ingredients.

Told ya I could see em fam! U can use most products up until 3rd week of flower. As long as ur not using anything systemic or something with heavy residual which can cause build up. Make sure to get the bottoms of ur leaves as well as the tops. Get something that kills all stages of spider mite including eggs. Is it indoors or outdoors. If indoors ull definitely need to implement some kind of preventative system. They got in some how eliminate the possibilities as u are treating. Then keep ur preventative system in place to not have a repeated event.

Just looked again with flashlight and magnifying glass, they are spinning mites

Found em?

I just read after that I can also use rapeseed oil, but it should not hit the flowers, the thing is the first flowers form

If your still in veg then you can easily use products that are specifically made for fighting spider mites. If its an outdoor grow you can spraying in the third week to prevent spider mites. First time I got them I used Buckley because they're made for vegetables, but there are various companies for this. By the first week they were all gone, keep spraying once a week to prevent from coming back. Now I've got a grow tent, keep it air tight and haven't had problems yet nor have i had to use it to prevent. (knock on wood) If your already in flower then its a little trickier, you'd have to hand apply under all the leaves, neem oil works good.