very blurry picture, but it looks to be that she is... if there are males in the tank with her then there is no doubt that she'll get pregnant again and again...
My standard answer to this one is - if she's female, a platy and she's been anywhere near a male platy, she'll be pregnant! It's very hard to NOT breed platies. They only need to mate once to be able to produce up to 6 batches of fry.