If you have a nice, cordial relationship you can call her and simply say that you had pest control come out to keep the ants away and they noticed the dirt pile in their yard and you would love to show her the pile and hope that she can do what is needed to remove the dirt and the ants. Keeping it simple and light and friendly is the way to go. I would hope that she will be responsive to this as I imagine she doesn't want the ant problem either and may not even be aware of the source.
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