rachelle owen , 16 , has died after being hit by a train at a crossing in wirral .
her mother kay diamond , 44 , was allegedly murdered two months ago .
friends said the schoolgirl ` just wanted to be with her mum ' after her death .
transport police said schoolgirl 's death is not being treated as suspicious .
transport police said schoolgirl 's death is not being treated as suspiciou .
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