I think she looks like a combination of Angelina Jolie and Alanis Morissette. Her lips are huge and may be the result of aggressive fat grafting. It's possible that people who have a large amount of fat grafted into their lips find their lips become excessively large when they become pregnant. Their tummy is not the only thing that grows! Her nose may also have had some work done, making it smaller and thinner than it was before. Without any "pre-surgical" photos, it's difficult to say for sure, but I think she's had both a lip augmentation and a rhinoplasty.
Update: The lips are probably natural. Suleman says she is not trying to copy or look like Angelina Jolie and that she has not had any cosmetic procedures done on her lips. She told NBC last night;
"I have never thought of Angelina Jolie except the last time I saw one of her movies. I think that was years ago. It is so far away from the place I'm in right now to think of think of any celebrity."
She also denied having her lips cosmetically changed.