There would be no penalty in this case. The law prohibits enforcement against the mother and activities that take place outside of the state are also not enforceable by Texas. The exception is if someone drives her to the state line for the purpose of obtaining an abortion or gives her money while both are situated in the State of Texas, although interesting would be a case where one is in Texas and the other isn't, bringing up the interstate commerce clause.
Texas allows medical exceptions. I have not yet read why this case did not qualify for the exception. Presumably because the court did not agree the mother's life was at serious risk? Has anyone a good read of the court's ruling?