My sons close friend in school mum is going a bad time ,her daughter might be diagnosed with some muscle problem and she is quite anxious and keeps telling me each day about it when we meet at school .I am also worried about her since she is a very good friend of mine .My son being very close to his son says is upset that I havent invited her son yet to his birthday party .Should I send her the invitation .I am quite anxious myself .I am quite sceptical myself.Please suggest