dyona why you cannot choose #2 She can have coffee in the cafe is a correct sentence, but it doesn't relate to the idea that Alice isn't in the office. Here's how #2 might be used: — Alice would like some coffee, but the office coffee-maker is broken. — That's OK.
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dyonawhy you cannot choose #2She can have coffee in the cafe is a correct sentence, but it doesn't relate to the idea that Alice isn't in the office.
dyona So, in the situation of this question about Alice, I think, "she can be having coffee in the cafe" does not make sense because the sentence is referring to the present location of Alice.I don't think it's that complicated. Only 'may', 'might', and 'could', but not 'can', are used in the given situation.