I guess she could be if she's a drug user.

Maybe Lake truly is 39.  Don't know about the drugs.

Ive seen the same ad in Chicago could be uncle Leo at work

You're making the assumption that she posted it.  The ad says the posters age is 39. Who knows who's posting for her.  
I'm guessing her grandkids might be 39.  Maybe they posted it. Or maybe she was just having a bad day.

Or just one of the hundreds of scammers who look for prey on backpage. I would say LE would think more bait would be had with pics of 20 something co eds rather than women who are 15 years away from getting social security checks.

I don't think she's unattractive though.