I understand that you wish to speak to her, but It is not possible to know exactly why she won't speak to you without more information. If you could provide some more context I might be able to provide a better suggestion.
If it is the case that she is just shy, then you could try asking her a more interesting question and see if she responds to it.
If it is the case that she just doesn't want to talk, it is best to respect her wishes and not talk to her.
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