what can I do?

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my cousin..she's one of my best friends too..well, she is in a relationship with this guy;she's been for more than ten years. now she calls me and -she really sounded out of her mind,I couldn't even say a word- tells me to give her the keys to our countryhouse because tomorrow, she wants to spend the night with this policeman she met and she's fallen in love with. first of all - she really sounded out of her mind and nuts about this guy second of all - damn! she doesn't even know this guy where the hell is she going?!?!?!!? then - if here in the house my mother for any reason goes and search for the keys...what am I gonna tell her!?!?!!??! I think the only way to get away with this is that she comes and make copies of the keys - then it's her own business. do you think I could try and persuade her not to do it? also because she's still with her man,this is cheating!but she could answer me to mind my business...then if she really wants to go,how can I provide for the keys? what if something happens to her?how can I be sure she's alright while she's there with this man?