Some of this thread is a gross over-complication. What matters is, or at least should be, the rule of law. We make it more difficult here than almost anywhere else because we require Two (2) witnesses, in addition to all the other evidence, to attest to the treason. In the age of the internet we have thousands of direct witnesses. She should avoid her home country like the plague because she is looking at a minimum of life without parole, and in most countries death. It boggles my mind that it's even a consideration for her to return after joining what is an enemy of every civilized state on planet earth. Try her and hang her publically if she's caught. Make it clear that if you engage in jihad you will end up in Hell one way or another, but it's an irreversible decision.
What is TREASON?
The offense of attempting to overthrow the government of the state to which the offender owes
allegiance; or of betraying the state into the hands of a foreign power. Webster. In England, treason is an offense particularly directed against the person of the sovereign, and consists (1) in
compassing or imagining the death of the king or queen, or their eldest son and heir; (2) in violating the king’s companion, or the king’s eldest daughter unmarried, or the wife of the king’s eldest son and heir; (3) in
levying war against the king in his realm; (4) in adhering to the king’s enemies in his realm, giving to them
aid and comfort in the realm or elsewhere, and (5) slaying the
chancellor, treasurer, or the king’s justices of the oue bench or the other, justices in eyre, or justices of assize, and all other justices assigned to hear and determine, being in their places doing their offices. 4 Steph. Comm. 1S5-103; 4 Bl. Comm. 76-84. “Treason against the
United States shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort.” U. S. Const, art 3,