Nope, actually she did travel back in time. Her mother is the one who can see the future. She saw the future so far that she saw Tia's second chance in life. (Spoiler alert)
That's why she planted the red flower that cured Gallahad incurable disease in the royal garden, thou it's not used to save him in the OG timeline it did save him in the current timeline. Tia's maternal grandmother also warned Tia that since she's only half-blood (Tia's mom Southener's blood is the one with magic power) She can only turn back time once and that the current timeline is the only chance she had left to obtain everything that she desire.
Okay so how old is Tia ? Her first life was as a Korean then her second life as Lombardi then she travelled back in time so how many years is that ? How old is she ?