A friend and I celebrated another friend's belated 30th birthday earlier today where we went to a local mall for lunch and then went to see a movie since we did not get a chance to do anything with her earlier this month when her real birthday occurred due to she going out of town with her parents.
However, I had discovered that my friend's mother had planned on holding a huge surprise birthday celebration for her 30th but had never given the time or the courtesy to contact or invite us. Yet, she invited everyone one of her parent's friends and family members in an area where they normally go camping. (My friend is under a guardianship by her parents because she is more severely disabled than the other girl and I. Her mother is also really overly protective of her daughter and also controls what she can and cannot do).
In many cases, my other friend and I have invited this girl to several other events including being a bride's maid on my other friend's wedding fairly recently. Yet, this girl's parents have not once bothered to invite myself or my other friend over for dinner. Instead, the other friend and I have had to suggest meeting this person somewhere like a mall or take her out to dinner rather than the other way around.
I am at the end of my ropes with her mother and I would like to speak my mind without making anyone angry or hurt. How should I confront her about this last issue?