How can i confront a liar?

ok so i know this girl who claims shes 7 months pregnant, but she doesnt show at all, im 30 weeks pregnant with a girl and my belly is HUGE, when i bumped into her belly it felt wobbly, and i told her i wanted to see sonogram pictures and she told me that the doctor said she doesnt do sonograms like come on i have gotten around 5 sonograms already 6 at 32 weeks, and then she said she did the diabetes test and said she has to go back in 2 weeks to get the results LOL thats such a lie, cuz i had to wait at least 2 or 3 hours to get my blood sugar levels read after i drank the liquid, and they told me i do have diabetes, so how can i confront her? oh yeah and i also saw her smoking so help? i want to confront her because she said that she wanted a bathtub for her baby and i bought it and she never sent me the address for her baby shower and she has no pictures or anything to prove. or shud i just beat the sh*t outta her?