What does "it is not like she'd Fedex a 6-carat diamond" mean in the following context?
Two young ladies chat and one feels like she would be proposed by her boy friend. She knew that her boy friend had a lunch with his family secretly and his mom flew in from the remote area. That is why she feels like she would be proposed by his boyfriend. Then, her friend also tries to cheer her up, saying that why else would she(his mom) have flown in from the remote area?, and "It is not like she would FedEx a 6-carat diamond".