I was "catfished" on pof, so if you're even slightly suspicious of a profile, do a reverse image search on google to check if her pictures appear elsewhere on the web.
Remember, if you meet up in real life...just be prepared for almost anything. Everyone uses their most flattering pictures with great lighting, so don't be "stunned" if she doesn't quite match her profile.....or in the worst case scenario, its a completely different girl (This happened to me).
Always make sure she has at least one "full body picture" to prove her size. A profile full of face pictures indicates a girl with potential weight problems.
Happy fishing :p