I agree with sending a carefully worded and loving letter with no apologies and no blame Colvillefly, simply explaining that the arguments are hurtful (you could say that they must be hurtful for her too) and in future if they start, you'll end the call.
It doesn't matter if she keeps hold of the letter because there'd be nothing wrong with it and as pascal's posted, a letter may give her the opportunity to think about how she's behaving and why.
You need to have boundaries to protect yourself and sometimes as upsetting as it is, you need to protect yourself from your own child, which you can do while remaining in contact.
Good luck
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What to do about my sister and my daughter
