I think that all she needs is the letter and prescription from the doctor. I don't think any training is required for that.
When questioned she just has to tell them she is a service dog and show the letter if necessary, but legally they can't even ask what the problem is that the dog is for.
At least that is what I remember from another discussion when this came up. You can google service dog and see what you come up with. Also with service dogs you don't even have to pay extra to have them fly with you.
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