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Which is correct:
1-I am happy to be seeing her tomorrow.
2-I am happy to be going to see her tomorrow.
3-I am happy about seeing her tomorrow.
4-I am happyto see her tomorrow.
I agree with Red.
1. One has an appointment and one is happy.
2. Same as 1, but a bit wordy.
3. Same as 1.
4. This is a bit idiomatic. It would normally be used as a proposed appointment. It awaits confirmation. The future tense "I will be" can also be used.
happy to 
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