How do you know she hadn't already been blacked. A woman built like that and that good looking must get hit on several times a week, maybe several times a day depending on what work she does, by whites, blacks and latinos. If she was interested in going black, she most likely would already have had opportunities that she could have acted on if she was interested. By her going through the trouble of getting the implants indicates that she likes to have the attention of men. Just ask her if she is interested in being blacked, but you could do it in a diplomatic way by saying you know this guy whose wife has gotten into IR sex and see what her reaction is. If she says she's not interested, don't push it.