I wasn't able to find information on the toxicity of the ingredients you mentioned, but camphor and menthol are strong substances and should be kept away from cats. Cats are extremely sensitive to chemicals, fragrances, etc., so it's best not to take any chances by preventing exposure to them. Star is probably reacting to the mint ingredient. It's impossible to say how this will affect her behavior - she may just react to it as she would to catnip, but again, since there are so many other ingredients, I would not let her be exposed to it.
I agree with what so many other members have already said - this woman and her child and bad for your son and your cats. I know this seems easy for me to say, but I'd no longer allow her or her child in my house. Finding responsible babysitters is always a headache and a challenge, but I'd move heaven and earth to find one rather than let that woman near my family. She's caused too much damage. A person who is unable to discipline her own child and shows no respect for animals is unfit to care for someone else's child.
I appreciate that you love Star and don't want to give her up. I hope you won't. What happened to Star occured because of poor judgment on the part of humans, and she should not be made to suffer because of it. There are many things you can do to help Star get past her trauma and again become the sweet friend you've known, but it will take time, patience and determination. An animal behaviorist, and/or the temporary use of anti-anxiety drugs could help tremendously. The first and most important step is to eliminate the cause of Star's trauma ASAP.
I'm rooting for you and Star. I hope someday soon you'll post that all is back to normal for your two and four-footed babies.