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I'd say something like 'It's great to talk to a happy person on the phone at last! Sounds like you're having a great day too.' Doesn't sound like you're hitting on her, doesn't sound sarcastic and doesn't bring any attention to her past crabbiness.
Just saying 'Wow, someone's having a great day' sounds a little sarcastic to me, and if she's aware that she's sounding more positive these days she might take it a bit backhandedly.
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