Ok, i will do my best with this:
Anything that is out on display eg. fruit bowl, should be freely available to everyone in the house. So you need to accept the fact that she is going to be munching your organic apples.
Likewise, any meal that she is eating with you, then she should have the same food as you. Full stop. However, bearing in mind that she is a hungry/growing person, maybe make extra carbs for her? Pasta, beans, pulses are all cheap and filling.
Wine - yes, you should offer her a glass if you are drinking it, assuming she is over 18. 
Expensive meats - if you really feel that you cant spare her a steak, maybe you and your husband should keep them for any nigh in the week when she habitually goes out. If you are buying last minute then it won't be in the fridge tempting her.
I do think that she should be able to have fish once a week if she wants to. Maybe the best thing is to buy some cheaper fish (frozen?) and suggest that she has it at lunchtime or when you go out yourselves.
Nespresso - just tell her it is quite pricey and that you only have 1 - 2 a day as a treat. Seriously, she is a young person and probably wont pick up on these things unless you tell her - I probably would not have done so at her age.
No junk/juice - that is fine to ask her to keep it out of sight. Buy her a mini-fridge for her room?
However, overall, I agree with other posters that you need to make her feel a bit more welcome, otherwise your next stop is going to be AuPairWorld again.