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The word 'tomorrow' implies that the sentence should be in the future sentence. Wouldn't the correct sentences be 'her train will leave tomorrow at 10AM' or 'her train will be leaving tomorrow at 10AM'?
How can the present tense be used for something that happens in the future?
When we use the present continuous to talk about a plan in the future, it is called Future Arrangement Present Continuous in English grammar. It is used to emphasis that you are certain that something will happen, to the point that you can talk about it as if it's already happening in front of your eyes.
Both "will be leaving" and "is leaving" are correct, but the latter implies more certainty, and is less formal. The Present continuous for future arrangements is usually used in spoken English.
