Feel bad about girlfriend visiting me

I am in an LDR with my girlfriend, which fortunately will end in 3 months when we can move together. ( I am going to move to be with her) She came to study here for a semester (she lives in another country) and went back at the beginning of the year. She tried to find work here at the same time but sadly did not, so it was her parents who were supporting her financially (they are quite well-off) She did not have to study here, but she did that to be close to me. Prior to that we were LDR for a few months, and I went over there every couple of weeks, and she also came here once. Since she left, I have been there twice, and had the intention to go there this week/next week. She told me it would be silly to come again at this time, as I would have to pay for accommodation and food as well as the flight this time (I cannot always stay at her house) but I am going for definite next month and staying at her house. Apparently, the last time I left, a couple of weeks ago, her parents told her not to worry and that they would pay for her to come back here next time. That is really kind of them, and she has a free week very soon, so she is looking at coming then. She has again spoken with them and they have offered to pay for her flight. The thing is, I feel bad about them paying and I really do not expect them to. I have my student loan and I have a job and a lot of savings, so affording the flights is not too much of a problem for me ( I do not want that to sound like I am boasting or something) but at the moment she has no source of income at all (her parents are supporting her) I know it is their choice if they want to pay for her, but I feel bad since they supported her for a few months when she last came here. I told her I really do understand if she could not come, and that I really felt bad about them paying/did not expect them to. I said it would be great to see her but I would be ok to wait until my next visit if we had to. She was thinking about it, so I asked her her decision (as I did not want the flight prices to increase) and she said she will come. She has not yet booked her flight, but I still feel bad. I honestly would have gone there and stayed at the hotel, but she told me it was a waste of money. I just feel selfish that they are paying for her to come here again. (Flights are around 80-115 pounds return) Should I tell her again? Or am I over-reacting? Thanks in advance.

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