As much as the feminist in me rales against it, I have to agree with what BRR is saying, with my personal caveats:
Family is very important to Latinas. If her family isn't in this country, be prepared to fly her to Brazil, regularly. Don't be surprised if she wants to ship members of her family here, for short or long term stays.
Religion is usually non-negotiable. If she's a Catholic, you'll need to convert or she will come to be truly miserable and she will make your life a living hell. Remember, hot blooded, passionate? Yeah, well, try nasty fucking tempers, too.
Okay, where did I come by my vast storehouse of knowledge
I knew (very, very well) someone who was married to TWO "mail order" Latin women (long story). The first one came from Mexico, the second from Peru. The first woman literally was sick every day of her life over the fact that her husband had divorced her (know why? Because she had a couple of kids and when she hit 40 she thickened up, not fat, just lost her waist). This poor woman truly believed that she was going to go to hell. The second one was more than 40 years younger than her husband, and almost half the age of the first wife. Anyway, the "new one," despite being in this country on his ticket, wouldn't marry him until he got the divorce turned into a proper church annulment (I shit you not).