Training
After getting the book from the labyrinth of magic, they all decided to go back to Austin's palace to rest and replenish their energy.
Their trip to three different places, Ireland, Svalbard, then to Machu Picchu was indeed tiring and they visited those places in order to get their hands on the book.
Of course, Atlas and Marcus followed and stayed in Austin's palace. He never was bothered that they were always around to watch the training either. Wherever Meredith is, the two will always be there.
Meredith had personally asked Austin to train her since she was perfectly influenced by her ancestors' and mother's magical prowess. The moment she got the book in her hands, she thought that she had to learn herself.
Never had she tried magic. She didn't even feel the surge within her and with her family background being the daughter of a strong vampire-werewolf and a powerful witch, she knew that she had to learn herself.