embarrassed to be with family or friends who have no manners

by Stephanie
(Arizona)

I love my sister-in-law, but I hate taking her out ANYWHERE. She has absolutely does not have any manners.

From dining out to attire, to conversation skills. Sometimes her attitude towards people (rolling her eyes at the waiter), her constant texting during dinner/converstaions and her loud belching every second of the day, or using her fingers to eat salad dressing left over from her meal, is embarrassing.

I was wondering, what is the best way to approach her. I feel that if I correct her, she will be offended and resistant. She's 23 years old, I feel that by now she should be conciously aware of her behavior, and that someone needs to put a stop a to it.

I would like to spend time with her - out in public- but at this point I cringe at the fact she's attending. WHAT TO DO?