"She said no such thing because no one asked her"
Let's see, Joseph knew and was going to put her away until God intervened. Elizabeth knew, and Simeon and Anna knew since they knew the prophecy and were waiting for Him. Anna told everyone about Him. But it doesn't make any difference who knew what. The Law is clear that if a woman gives birth to a male child she is impure. Lev. 12:1, "If a woman have conceived seed, and born a man child: then she shall be unclean seven days...". There is no evidence that His birth was any different than any other male child; the angelic announcements excepted.
There was no seed and no conception, unless you subscribe to Mormon interpretation of Luke 1:35 that the "Holy Ghost shall come upon thee" and "the power of the Highest shall overshadow thee," — words Mormons interpret as "carnal relationship."