The answer is here:   

Typically, when the accompanying clause is an "if" clause, the historical present tense forms go with present tense verbs, and historical past tense forms go with past tense verbs. However, "could" and "might", meaning "may" ("it is possible"), can be used with present tense verbs (as well as with past tense verbs). "should" has lost most of its force as a past tense and is better thought of as a present tense form in modern English, meaning "it is advisable". ("shall" is the least used of the modals shown above.) The result of all these historical changes is that in modern English we have far more choices in sentences with a present point of view than in those with a past point of view.   

As for the third type, if she had had time, she "could have done" , "would have done", "should have done", "must have done", "might have done" etc. can be used.