Do you think she lied about being pregnant?

So my sister supposedly gave birth on June 15th, she sent me, her family and friends a picture of her baby,but she was not holding It, It was just a picture of the baby. while she was pregnant and In the delivery room, her ''husband'' was texting me telling me she was In a lot of pain and he was also pretending his english was bad, I don't know If It was him I was texting or her pretending I am texting her so called husband, this was on June 14th, then he had texted me on June 15th, because he had her cell phone and told me that she had her baby on June 15th. when she sent me a picture of It through her cell phone, I believed It was her baby, but I just figured out, she took this picture with her cell phone as In she has this picture developed. my mom has asked her for her address as she lives out of town from us, because she wanted to help her out with baby clothes, etc..she refused to give her the address and she doesn't even talk about her ''husband'' much. she told us during the Summer she will visit with her son. Yesterday, she told us her baby died and how she can't stop crying, but when I asked her how did It die, she did not answer, and came up with an excuse her phone Is dying and has to recharge her phone. Do you think she lied about her being pregnant the whole time?