subjunctive clause and objective clause

Please, help me to get rid from following problems:
1) He proposed to her, who had requited his love from the moment they met.

2) She, whom he had met only two weeks before, thought his proposal premature.

3) I am asking her, who is a doctor.

4) It is he whom they provoke to anger.

a) In first example, 'who' is indicating to 'her'. But 'who' is subjective case while 'her' is objective case. In second example 'whom' is indicating to 'she'. Here, 'she' is subjective case, where 'whom' is objective case. Are these sentences are right? If these are wrong, please give the right form them.

b) Are 3 and 4 are right? If these sentences are right, why the first and second sentences will be wrong? If they are wrong, please give the right form of them.