If your experience with that service was leading you to write a review that triggers the service provider in such a way that they threaten your child with a curse I would really not be concerned about anything. In my experience the loudest and most threatening practicioners bring the fewest to the table, so they have to pump themselves up to look bigger (like raccoons, but less adorable).
If you want to stay on the side of safety regardless I would put a return to sender rite in place. Just search for “return to sender” here and you will find different approaches. @crookedpathfinder gave a good example in this thread here:
In addition I would ask a spirit or deity with motherly aspects for protection of your child (for example like Durga, Danu, Isis or Hariti).
Otherwise I would not entertain any form of contact to that person (if she has vampiric traits she will siphon energy off your fear), don’t grant them your attention or time. Block her and make sure that she can’t snoop around for more contact data about your kid. Stonewall the shit out of her if you’re done with your rituals. Do not acknowledge her presence in your life whatsoever. That will dry out her energetic and emotional access to you. She sounds like a narc and thats the best way to deal with them.