I would say that the Paphs are easier out of those three, but the Oncidiums mentioned already would be my pick for a starter orchid. Phrags can be a bit finicky and with Phals, if anything goes wrong with the crown, it's probably game over. I say Oncidium because of your worry about her underwatering and the fact that they are sympodial...if something goes wrong with the mature growth, it's bound to put out a new one.
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