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I'm unclear as to your question. Are you worried that if your daughter goes to the local school she will have contact with the GF and mother? How old is your daughter? What type of interference are you worried about?
Thank you - I understand better now.
It sounds like you may have a civil harassment case. In CA, do an internet search for CH-150, which I believe is the form number for the instruction sheet on civil harassment. This is probably your best bet at stopping and preventing this type of behaviour.