I kind of see it the other way round. I believe on that trip she felt that she could really be herself and live up to her potential. Meet new challenges, be active, experience so many new things, conquer new territory so to speak. It suited her personality to a t to be on the road, never growing roots anywhere. A rolling stone. I believe what we see in the blog posts and pictures, that was the real Leanne, the person she wanted to be and really was. I think when they came back she realized that she wouldn't be able to experience this intense feeling of joy for a long time. For starters, they had no money left and finding a job was now important. Then there were plans to start a family which also doesn't lend itself to a gypsie lifestyle. She might have felt that she never truly could be herself again and be truly happy and fulfilled, and that there was no way out.
This is just moo.
I so wish she would have seen another way for herself. I so wish!