Bangkok: Six years after being swept into power on a landslide victory Thailand's first female prime minister is facing financial ruin and jail.

But Yingluck Shinawatra, whose fairytale leadership ended before generals toppled her administration in a 2014 coup, has denied speculation she intends to flee the country like her famous elder brother Thaksin Shinawatra, who has lived in exile for more than a decade.

"What I can say is that I'm still strong and ready to fight to prove my innocence," she said in a Facebook post.

Ms Yingluck questioned a move by the military government in Bangkok to freeze her assets in relation to a $US1 billion ($1.2 billion) fine imposed over one of her government's policies to subsidise rice farmers, the latest in a barrage of legal battles she has fought since leaving office.