A child born under her exact situation will be deported. It doesn’t apply to her only because it is not retroactive.

Her birth fell under the second direct quote from the EO as per below:

The privilege of U.S. citizenship "does not automatically extend" to children born in the U.S. when the mother was "unlawfully present in the United States and the father was not a United States citizen or lawful permanent resident at the time of said person's birth" or when the "mother’s presence in the United States at the time of said person’s birth was lawful but temporary."