..... Granted the flight had marshals onboard.....
..and your source for that information is?
As for TSA security point being “breeched”....well if the lady by passed security without being screened at all that would be a major foul up to say the least...if OTOH she somehow blagged her way through but was screened then perhaps the risk is perhaps not as elevated as some are suggesting. Ultimately though, no it shouldn't have happened.