After one year of paktoh suddenly no interest in physical intimacy? Hmmm, could either 1) Hormones. Or 2) There was something else going on.

Withdrawing from you physically all the sudden may mean that she's getting it elsewhere. She no longer feels the physical connection to do it with you. Or maybe she felt guilty. Even possible that after having 'experienced' elsewhere, she's afraid that she may have picked up new "style, skill, aura, and body language", which may give away her position that she's eaten elsewhere, so she rather avoid you altogether so you don't pick it up.

Or recently troubles in relationship is affecting her mood?

Could have many reasons to it. But one thing for sure, doesn't sound like good news to me.