<human>: We've been together nearly 2 years and it's been going amazingly, we live together in a house with 4 other students and booked a backpacking trip back in December for this August/Sept.

Ever since we've booked flights she hasn't really talked about the trip, whilst I've been doing occasional research which rarely gets met with much enthusiasm - I wasn't too bothered until recently when she's been increasingly talking about how short on money she is. 

I should add that we tried to book this a whole year ago (for summer 2012) but she pulled out ON THE DAY we were going to book flights because she freaked out about money.

I think money's a stressful subject for her whilst i've always been pretty relaxed, i'm not well off, but if I want to do something i'll just get any job and work until the money's there. She's much more cautious and gets really defensive if i try and talk about it.

I've tried discussing the trip tonight and it just led to an argument with her getting super defensive, and insisting that this was 'what she wanted' when I asked if she really wanted to go. Despite this, she's offered no interest in the trip, never said anything about being excited, I know its still a while off but still...

I'm just worried that i've got her into something she now regrets but won't admit because of how gutted I was last time she cancelled. How should I go about finding out her true feelings on it? Cause it definitely feels like she's holding something back.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Booked a backpacking holiday with my GF which I suspect she now regrets due to her showing no interest/excitement and her being extremely money-conscious, how do I proceed