I love her to death but I think she’s a bit clueless as to IOI’s with men. So I was wondering if there were any books you lovely ladies can suggest for her. Body language in general I can go over with her but my knowledge of women attracting men is pretty incomplete. Thanks 
Hey 2000GT, being reasonably clueless myself, this helped me:
How do I know if I am getting hits !!
Don’t know if you already thought of it, but it’s my best suggestion, not being used to male non-verbal expressions of interest. 
Are you asking what body language men use when attracted to a women or how women attract men with body language ?
This will cover both and I suggest it to clients
The Flirting Bible: Your Ultimate Photo Guide to Reading Body Language, Getting Noticed, and Meeting More People Than You Ever Thought Possible: Greene, Fran: 9781592334216: Amazon.com: Books : The Flirting Bible: Your Ultimate Photo Guide to Reading Body Language, Getting Noticed, and Meeting More People Than You Ever Thought Possible (9781592334216): Fran Greene: Books
I really liked this one because its about all types of body language and you want her to be aware of preditory language as well. Being her big brother you have to watch out for her LOL
Amazon.com: What Every Body Is Saying: An Ex-FBI Agent's Guide to Speed-Reading People: 9780061438295: Navarro, Joe, Karlins, Marvin: Books : What Every BODY is Saying: An Ex-FBI Agent’s Guide to Speed-Reading People (9780061438295): Joe Navarro, Marvin Karlins: Books
Secrets of Sexual Body Language: Lloyd-Elliott, Martin: 9781569755242: Amazon.com: Books Secrets of Sexual Body Language (9781569755242): Martin Lloyd-Elliott: Books
Love Signals: A Practical Field Guide to the Body Language of Courtship: Givens, David: 9780312315061: Amazon.com: Books : Love Signals: A Practical Field Guide to the Body Language of Courtship (9780312315061): David Givens: Books
And online my favorite site is
Tisha
Tisha has given some great books. Lol, I didn’t know about the “Flirting bible” tish… got to get me that one in the future when life is running smoothly lol.
I’ve read what “What Every BODY is Saying: An Ex-FBI Agent’s Guide to Speed-Reading People” and it’s a really good book - it’s not really hard core dating material but it is very useful when you’re trying to figure out the truth. So pretend there’s some dude trying to take advantage of her and he’s showing physical signs that he’s lying - she’ll know (pssst - next!).
How old is your sister? LOL well if she’s younger than you I’d also suggest
Why Men Love Bitches: From Doormat to Dreamgirl―A Woman's Guide to Holding Her Own in a Relationship: Argov, Sherry: 9781580627566: Books - Amazon.ca Why Men Love Bitches: From Doormat to Dreamgirl - A Woman’s Guide to Holding Her Own in a Relationship: Amazon.ca: Sherry Argov: Books
I didn’t know about this book until all my girl friends started reading it (you may be surprised that many men agreed with some of the stuff in this book). The title of the book might scare the guys away… but really when Argov say’s “bitch” she doesn’t mean - be a bitter, dominant woman and slave drive that guy! LOL
Great book, it’s funny, empowering, and gives scenarios of dates (dos and don’ts which mostly makes sense).
Thanks guys, this is plenty for me to go on.
@Tish: Well, it’s for her benefit. Between her and me, I’ve been the more observant and I think she’s missed out on some serious hits, so some reading material I think would help.
@msselva:She’s in her mid 30’s.
She’s coming up for the week so I’m going to see if I can suggest pheros as well. She’s had plenty of dates but I think she’s overly picky, she always seems to find something wrong with the guy she’s dating or can’t spot any positive hits until after the fact. :-/