One would have to look at the relevant Virginia statutes at the time of the kidnapping as well as the laws since to work that out. However, probation is almost certainly not going to be an option. Under current Virginia law kidnapping is generally a class 5 felony, punishable by no less than one year and no more than 10 years in prison. Virginia has no statute of limitations on kidnapping, so she could still be prosecuted for it. Note that the child is not the only victim here. The birth parents and other birth family members are, too, as they were deprived of a family member as a result of what was done. I don't see a Virginia judge taking that lightly, particularly in the more rural and conservative parts of the state.
She could also be charged by the federal government for kidnapping, especially since it resulted in taking the child across state lines. When the person taken is a child and the kidnapper is an adult, federal law provides that the kidnapper shall be sentenced to no less than 20 years in prison and may be sentenced to up to life in prison. So if the feds picked up the case, she would serve a very long time in prison. Note that she could end up serving time for both the Virginia crime and the federal offense consecutively.

