You haven't stated whether your friend is a Christian or not, which would affect the way to approach this.
As far as 'dating' goes, we don't know enough for any of us, possibly even you, to know the details of her marriage. Maybe (in secret) her marriage was unhappy and it was a relief to be free of it (i know, i know, you 'know' for a fact this isn't true, because she wouldn't withhold anything like that from you. Reality is people hide such things all the time from close friends and family).
The sex aspect, depends more on if she's a Christian or not. That she jumps into bed with 4 men within 6 months does suggest a leaning towards trying to fill the time, and void left behind, it could, as stated above, be a chance for her to live out what she's been waiting for.
Really it's hard to answer. And as far as taking a poll i won't answer as it's not any of our business to answer it really. You can get all the poll answers you want, but it doesn't change a thing. Just puts her business out there for other people who don't know her, or anything about her or what she's going through, to criticize her.