what is the word which best describe the feeling of getting disappointed when things do not go as you hope? For example, a daughter was expecting to visit her parents this weekend after years apart. She got very excited about it. And then something came up and she couldnt make it. How to describe the feeling of being very excited and then get disappointed?
I suggest deflated. My dictionary (Chambers, 11th end) defines deflate thiswise:
(vt and vi) to collapse or cause to collapse due to emptying of gas; (of one's hopes, ego, etc) to reduce in extent due to disappointment, criticism, etc; (of an economy) to cause deflation in or suffer from deflation.
and it's that middle definition (the one I made bold) you're looking for. To fit the situation in your question one might regard the building up of her excitement as inflation, and the later disappointment as deflation.
Her hopes were dashed.
dash someone's hopes.
Destroy someone's plans, disappoint or disillusion. For example, That fall dashed her hopes of a gold medal.
This term uses dash in the sense of “destroy,” a usage surviving only in this idiom. [Second half of 1500s].
Edit: I just realised OP wanted a single word, but I’ll leave this in case it’s useful; anyway, I can’t think of a word that communicates the emotional rollercoaster mentioned!