When will Tessa die?

Tessa is now married to Jem and they have a daughter and she’s so happy, they’re all so happy. But I can’t help but think about what’s going to happen to Tessa as they grow old without her, it’s happened before with Will, James, and Lucie, and to put it as simple as possible, it was hard for her and was hard for many years after. Having to outlive not only your love but your kids as well is painful. Meeting Jem at Blackfrairs Bridge all those years is something that helped her hold on. But he’s no longer a silent brother, and although they are married with a child, it means he can no longer stay with Tessa forever. When he dies Tessa’s two greatest loves will be gone forever. Is she going to go with Jem to join Will in the afterlife? She misses Will terribly. Is she going to keep living after Jem dies or will she close the book on her life? She can’t die of old age so she would have to do something to herself and I don’t know how Jem would feel about that. What would he tell her: that he will happily cross with her over to the next life or ask her to stay? When Mina is born Tessa thinks of how painful it’s going to be having to yet again watch as her love and child have to grow old without her and their deaths. Does she have plans to stay, or is she ready to cross with Jem and meet Will again?