Don't change your plans, give her the invitation. Its still her son. AS talks about detaching with love. IMO it's the right thing to do, to invite your son mother to his party. He will love if she shows up.
M:37 W:37 T:11 M:10 S17, S13, S10, S4 BD:06/28/17 OM confirmed 07/20/17 Recon the M 10/29/17 Working hard:2gether
Onward and forward
This process is not a sprint it's a marathon! Patience, Patience, Patience.