Maybe she feels the excitements gone and isn't ready to settle into the cuddles and kids of marriage. Do something fun, crazy and romantic to win her over. Shes probably just scared and although you might ask why bother.. Women are strange creatures and don't always express themselves in the right way or make rational decisions.. You can at least try and then see how it pans out. I'd think if my fiancé was willing to lose me without any fight or effort then he wasn't worth spending the rest of my life with. Don't think the worst, she probably got a taste of excitement and freedom in s Africa and isn't willing to give that up.. Show her you can help her keep that feeling rather than snuffing it out?