LDR - issue with my parents

I've been in a long distance relationship now for almost 6 months. I really get along with my boyfriends family and actually prefer being at his house to being at my own most of the time, although that's probably down to the fact that he's there. I'm 16 years old and in year 11, I study hard and have a weekend job that's pretty versatile in that if I can't work then it's fine, I won't get fired I'll just work another weekend instead. I'm in a bit of an annoying situation, because basically I get to see my boyfriend every 2 weeks. We alternate between him coming here and me going there, but this weekend I was at his house. One of his friends then invited myself and him to her birthday party which is next weekend. When I mentioned this to my mum she said that it "wasn't normal" for me to go and see him so often, and that I should "spend a weekend at home", when all I'd be doing is sleeping and working no doubt. She seems to think that seeing him more than every 2 weeks is really strange, when it's actually abnormal to see your boyfriend as little as I do (except other LDR's obviously). I understand that she wants me to do good in my exams, and I am determined to achieve my predicted grades of A*s and A's, but I think it's not unreasonable to want to see my boyfriend more often sometimes than just our normal every-2-weeks thing, especially since it gives me an opportunity to get closer to his friends/getting to know them which I'm looking forward to. I really feel like she's treating me as though I'm too young to cope with 2 weekends a way in a row.. despite the fact that I organise, book and pay for everything myself when I do visit him and she has to do nothing in order for me to go. Am I pushing my luck or is she just being unreasonable? How would I go about talking to her and getting her to understand that I can focus on exams and have a healthy relationship at the same time? Please bear in mind that's she's a very "I'm right and that's that" parent, I have to try very very hard to get my point across after she's made up her mind... Any help is really appreciated!!

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