She sold 200,000 copies of her book from back in chapter 17. Even if thats her only published book, she would still have made quite a bit of money off that alone. Plus university professors generally make well above $100,000 a year. It's not surprising that she's able to throw money around like...
Omg she is living the dream right now, I so happy for her yet so incredibly jealous that I can't have that. Tongtong is a total angel, but the instinct to collar her girl like that is insane.