Got to get this off my chest....

Am I out of line to think that my ex's girlfriend is going too far?  Here is the series of events that have been occuring lately...
It all started with the girlfriend deciding that it would be a good idea to be the room mom for my son's 1st grade classroom....Why would that be ok? She does not have any kids....my ex claims that he suggested it because the teacher was having trouble finding one....
Next...at my son's football game, he was not feeling well...so he came and sat on my lap during the game to rest.  The girlfriend came over to "mother" him...give him a cold towel...ask him if he was ok...ask him if he wanted to go and lay down in her car...
Now...I find a note written to him in the bag of stuff that my ex dropped off to me...

Am I wrong to think that she is being kind of creepy...and taking this whole thing too far?  It is not her son...why would she think that I would be ok with what she is doing...?

Here is my take on it...
I think she is doing it on purpose...I feel like she is bullying me....deliberately doing things to make me upset...I think she is trying to make me look like the bad person...the crazy person...I think she is hoping that I fly off the handle in public and act crazy....but I'm not going to do that.
I am not going to sit back and allow her to push her way in...she did that to my marriage...fine...she can have him...but now she is trying to do the same thing with my son...not her son...MY SON!!!

Ok...now to get some sleep....this is not going to go away any time soon...I know that...I have to find a way to deal with it...but I expect that  I will be speaking with dear girlfriend before too long....

Jenn