AITAH?

I (M25) have been dating K (F27) for 6 months now.. I know it is not much but I would say I have enough judgment to say if I want to build something long term or not and we are both aiming to build something long term. She is an amazing partner and everything if not more what I wished for in a partner. Before I tell my story and ask I want to declare that I do understand that nobody owes me anything and every decision I make is mine to be done and I alone have to bear the consequences.

We live some hours away from each other so we see each other every 2nd weekend (3-4 days). We both are students and I work a lot so I can finance the trips which are costly. I am fine with paying for them but recently I have had the thought more often. She tells me how she goes out with friends where she spends around 20-30€ each time (2-3x a week) spends money on clothes she doesnt need and so on. She says she doesn't have money to buy or invest in important things that are not mandatory but still important. She does have money issues but I dont get why be so wasteful with it. Regardless of that, its her money, not my job to tell her what to do. Recently however, I have been thinking why does she never even offer to help me with the costs or just suggest it at least but has money to go out a lot. I am constantly thinking I could have bought a new phone by now with the money i am investing and other nice things I really want. This might be really bad thinking and as I stated above, i am doing the decision of spending this money to travel to her. (Her coming to me is sadly not an option) So I am wondering am I wrong to think my partner should offer at least or consider to help me out since its also something she wants?