How would you ask a stranger for help ( phone call )?

ok so i have a problem

My friend ( secretly my lover her name is Jessica ) is in trouble because of me with her parents & im not allowed to call her house or her parents will kill me.

So i have my Girlfriends ..friends phone number (Amanda)
.. but how do i explain to her that i need her help to talk to my GF if she doesn't know me and i don't know her
 
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