'He asked a lot of questions to her ' is not natural, but neither is 'He asked a lot of questions of her'. The simplest natural form is, 'He asked her a lot of questions'.
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miles Lee "This is the suspect to whom the police asked many questions."No
miles Lee"I'm not sure to whom I shoud ask this question."No
miles LeeMaybe what I really want to know is "is 'to' compatible with ask if the sentence takes relative pronouns.?"No
miles LeeSomebody argues that the sentence "He asked a lot of questions to her." is grammatical."Somebody" is full of prunes.