Kathy, there is a big difference between being told not to cry because you don't have the "right" to have feelings and between being told not to because it's putting you in physical risk.
You have clearly stated it will be fine in a few days. You have simply tried to get her to delay it.. not stop it as she would probably end up in the hospital again.
My suggestion. Ensure you stress that you simply need her to delay her tears for now and that it's okay for how she is feeling. Push that it will physically cause harm at the moment. I would also recommend trying to get her involved in helping with some aspect of the trip to help her feel that it's a reality.
I do hope she is feeling better. And thanks for sharing with us.
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